diff --git a/td/generate/scheme/td_api.tl b/td/generate/scheme/td_api.tl
index ac1659f72..89086fa3b 100644
--- a/td/generate/scheme/td_api.tl
+++ b/td/generate/scheme/td_api.tl
@@ -4587,6 +4587,12 @@ editInlineMessageReplyMarkup inline_message_id:string reply_markup:ReplyMarkup =
 editMessageSchedulingState chat_id:int53 message_id:int53 scheduling_state:MessageSchedulingState = Ok;
 
 
+//@description Changes chosen reaction for a message
+//@chat_id Identifier of the chat to which the message belongs
+//@message_id Identifier of the message
+//@reaction Text representation of the chosen reaction, or an empty string to remove reaction
+setMessageReaction chat_id:int53 message_id:int53 reaction:string = Ok;
+
 //@description Returns reactions chosen for a message, along with their source
 //@chat_id Identifier of the chat to which the message belongs
 //@message_id Identifier of the message
diff --git a/td/telegram/MessageContent.cpp b/td/telegram/MessageContent.cpp
index 93b488947..fee067b9b 100644
--- a/td/telegram/MessageContent.cpp
+++ b/td/telegram/MessageContent.cpp
@@ -5649,6 +5649,10 @@ bool is_unsent_animated_emoji_click(Td *td, DialogId dialog_id, const DialogActi
   return !td->stickers_manager_->is_sent_animated_emoji_click(dialog_id, remove_emoji_modifiers(emoji));
 }
 
+bool is_active_reaction(Td *td, const string &reaction) {
+  return td->stickers_manager_->is_active_reaction(reaction);
+}
+
 void on_dialog_used(TopDialogCategory category, DialogId dialog_id, int32 date) {
   send_closure(G()->top_dialog_manager(), &TopDialogManager::on_dialog_used, category, dialog_id, date);
 }
diff --git a/td/telegram/MessageContent.h b/td/telegram/MessageContent.h
index b74177e9d..31ce83f38 100644
--- a/td/telegram/MessageContent.h
+++ b/td/telegram/MessageContent.h
@@ -248,6 +248,8 @@ void on_sent_message_content(Td *td, const MessageContent *content);
 
 bool is_unsent_animated_emoji_click(Td *td, DialogId dialog_id, const DialogAction &action);
 
+bool is_active_reaction(Td *td, const string &reaction);
+
 void on_dialog_used(TopDialogCategory category, DialogId dialog_id, int32 date);
 
 void update_used_hashtags(Td *td, const MessageContent *content);
diff --git a/td/telegram/MessageReaction.cpp b/td/telegram/MessageReaction.cpp
index 173951d15..2415d2f6f 100644
--- a/td/telegram/MessageReaction.cpp
+++ b/td/telegram/MessageReaction.cpp
@@ -9,6 +9,7 @@
 #include "td/telegram/ContactsManager.h"
 #include "td/telegram/MessagesManager.h"
 #include "td/telegram/Td.h"
+#include "td/telegram/UpdatesManager.h"
 
 #include "td/utils/algorithm.h"
 #include "td/utils/buffer.h"
@@ -18,6 +19,50 @@
 
 namespace td {
 
+class SendReactionQuery final : public Td::ResultHandler {
+  Promise<Unit> promise_;
+  DialogId dialog_id_;
+  MessageId message_id_;
+
+ public:
+  explicit SendReactionQuery(Promise<Unit> &&promise) : promise_(std::move(promise)) {
+  }
+
+  void send(FullMessageId full_message_id, string reaction) {
+    dialog_id_ = full_message_id.get_dialog_id();
+    message_id_ = full_message_id.get_message_id();
+
+    auto input_peer = td_->messages_manager_->get_input_peer(dialog_id_, AccessRights::Read);
+    if (input_peer == nullptr) {
+      return on_error(Status::Error(400, "Can't access the chat"));
+    }
+
+    int32 flags = 0;
+    if (!reaction.empty()) {
+      flags |= telegram_api::messages_sendReaction::REACTION_MASK;
+    }
+
+    send_query(G()->net_query_creator().create(telegram_api::messages_sendReaction(
+        flags, std::move(input_peer), message_id_.get_server_message_id().get(), reaction)));
+  }
+
+  void on_result(BufferSlice packet) final {
+    auto result_ptr = fetch_result<telegram_api::messages_sendReaction>(packet);
+    if (result_ptr.is_error()) {
+      return on_error(result_ptr.move_as_error());
+    }
+
+    auto ptr = result_ptr.move_as_ok();
+    LOG(INFO) << "Receive result for SendReactionQuery: " << to_string(ptr);
+    td_->updates_manager_->on_get_updates(std::move(ptr), std::move(promise_));
+  }
+
+  void on_error(Status status) final {
+    td_->messages_manager_->on_get_dialog_error(dialog_id_, status, "SendReactionQuery");
+    promise_.set_error(std::move(status));
+  }
+};
+
 class GetMessageReactionsListQuery final : public Td::ResultHandler {
   Promise<td_api::object_ptr<td_api::chosenReactions>> promise_;
   DialogId dialog_id_;
@@ -95,6 +140,19 @@ class GetMessageReactionsListQuery final : public Td::ResultHandler {
   }
 };
 
+void MessageReaction::set_is_chosen(bool is_chosen, DialogId chooser_dialog_id) {
+  if (is_chosen_ == is_chosen) {
+    return;
+  }
+
+  is_chosen_ = is_chosen;
+
+  if (chooser_dialog_id.is_valid()) {
+    choose_count_ += is_chosen_ ? 1 : -1;
+    // TODO update recent_chooser_dialog_ids_, but only if not broadcast
+  }
+}
+
 td_api::object_ptr<td_api::messageReaction> MessageReaction::get_message_reaction_object(Td *td) const {
   CHECK(!is_empty());
 
@@ -250,13 +308,17 @@ bool MessageReactions::need_update_message_reactions(const MessageReactions *old
     return true;
   }
 
-  // has_pending_reaction_ and old_chosen_reaction_ don't affect visible state
+  // has_pending_reaction_ doesn't affect visible state
   // compare all other fields
   return old_reactions->reactions_ != new_reactions->reactions_ || old_reactions->is_min_ != new_reactions->is_min_ ||
          old_reactions->can_see_all_choosers_ != new_reactions->can_see_all_choosers_ ||
          old_reactions->need_polling_ != new_reactions->need_polling_;
 }
 
+void set_message_reaction(Td *td, FullMessageId full_message_id, string reaction, Promise<Unit> &&promise) {
+  td->create_handler<SendReactionQuery>(std::move(promise))->send(full_message_id, std::move(reaction));
+}
+
 void get_message_chosen_reactions(Td *td, FullMessageId full_message_id, string reaction, string offset, int32 limit,
                                   Promise<td_api::object_ptr<td_api::chosenReactions>> &&promise) {
   if (!td->messages_manager_->have_message_force(full_message_id, "get_message_chosen_reactions")) {
@@ -264,7 +326,8 @@ void get_message_chosen_reactions(Td *td, FullMessageId full_message_id, string
   }
 
   auto message_id = full_message_id.get_message_id();
-  if (!message_id.is_valid() || !message_id.is_server()) {
+  if (full_message_id.get_dialog_id().get_type() == DialogType::SecretChat || !message_id.is_valid() ||
+      !message_id.is_server()) {
     return promise.set_value(td_api::make_object<td_api::chosenReactions>(0, Auto(), string()));
   }
 
diff --git a/td/telegram/MessageReaction.h b/td/telegram/MessageReaction.h
index 0282baa7c..353183f5d 100644
--- a/td/telegram/MessageReaction.h
+++ b/td/telegram/MessageReaction.h
@@ -41,7 +41,7 @@ class MessageReaction {
 
   MessageReaction() = default;
 
-  MessageReaction(string &&reaction, int32 choose_count, bool is_chosen, vector<DialogId> &&recent_chooser_dialog_ids,
+  MessageReaction(string reaction, int32 choose_count, bool is_chosen, vector<DialogId> &&recent_chooser_dialog_ids,
                   vector<std::pair<ChannelId, MinChannel>> &&recent_chooser_min_channels)
       : reaction_(std::move(reaction))
       , choose_count_(choose_count)
@@ -62,9 +62,7 @@ class MessageReaction {
     return is_chosen_;
   }
 
-  void set_is_chosen(bool is_chosen) {
-    is_chosen_ = is_chosen;
-  }
+  void set_is_chosen(bool is_chosen, DialogId chooser_dialog_id = DialogId());
 
   const vector<DialogId> &get_recent_chooser_dialog_ids() const {
     return recent_chooser_dialog_ids_;
@@ -97,7 +95,6 @@ struct MessageReactions {
   bool need_polling_ = true;
   bool can_see_all_choosers_ = false;
   bool has_pending_reaction_ = false;
-  string old_chosen_reaction_;
 
   MessageReactions() = default;
 
@@ -117,6 +114,8 @@ struct MessageReactions {
   void parse(ParserT &parser);
 };
 
+void set_message_reaction(Td *td, FullMessageId full_message_id, string reaction, Promise<Unit> &&promise);
+
 void get_message_chosen_reactions(Td *td, FullMessageId full_message_id, string reaction, string offset, int32 limit,
                                   Promise<td_api::object_ptr<td_api::chosenReactions>> &&promise);
 
diff --git a/td/telegram/MessageReaction.hpp b/td/telegram/MessageReaction.hpp
index d6d06a4ec..807eafa96 100644
--- a/td/telegram/MessageReaction.hpp
+++ b/td/telegram/MessageReaction.hpp
@@ -56,41 +56,31 @@ void MessageReaction::parse(ParserT &parser) {
 template <class StorerT>
 void MessageReactions::store(StorerT &storer) const {
   bool has_reactions = !reactions_.empty();
-  bool has_old_chosen_reaction = !old_chosen_reaction_.empty();
   BEGIN_STORE_FLAGS();
   STORE_FLAG(is_min_);
   STORE_FLAG(need_polling_);
   STORE_FLAG(can_see_all_choosers_);
   STORE_FLAG(has_pending_reaction_);
   STORE_FLAG(has_reactions);
-  STORE_FLAG(has_old_chosen_reaction);
   END_STORE_FLAGS();
   if (has_reactions) {
     td::store(reactions_, storer);
   }
-  if (has_old_chosen_reaction) {
-    td::store(old_chosen_reaction_, storer);
-  }
 }
 
 template <class ParserT>
 void MessageReactions::parse(ParserT &parser) {
   bool has_reactions;
-  bool has_old_chosen_reaction;
   BEGIN_PARSE_FLAGS();
   PARSE_FLAG(is_min_);
   PARSE_FLAG(need_polling_);
   PARSE_FLAG(can_see_all_choosers_);
   PARSE_FLAG(has_pending_reaction_);
   PARSE_FLAG(has_reactions);
-  PARSE_FLAG(has_old_chosen_reaction);
   END_PARSE_FLAGS();
   if (has_reactions) {
     td::parse(reactions_, parser);
   }
-  if (has_old_chosen_reaction) {
-    td::parse(old_chosen_reaction_, parser);
-  }
 }
 
 }  // namespace td
diff --git a/td/telegram/MessagesManager.cpp b/td/telegram/MessagesManager.cpp
index f03694521..a7ab06ba5 100644
--- a/td/telegram/MessagesManager.cpp
+++ b/td/telegram/MessagesManager.cpp
@@ -23720,6 +23720,72 @@ void MessagesManager::on_get_scheduled_messages_from_database(DialogId dialog_id
   }
 }
 
+void MessagesManager::set_message_reaction(FullMessageId full_message_id, string reaction, Promise<Unit> &&promise) {
+  auto dialog_id = full_message_id.get_dialog_id();
+  Dialog *d = get_dialog_force(dialog_id, "set_message_reaction");
+  if (d == nullptr) {
+    return promise.set_error(Status::Error(400, "Chat not found"));
+  }
+
+  Message *m = get_message_force(d, full_message_id.get_message_id(), "set_message_reaction");
+  if (m == nullptr) {
+    return promise.set_error(Status::Error(400, "Message not found"));
+  }
+
+  if (full_message_id.get_dialog_id().get_type() == DialogType::SecretChat || !m->message_id.is_valid() ||
+      !m->message_id.is_server()) {
+    return promise.set_error(Status::Error(400, "Message can't have reactions"));
+  }
+
+  if (!reaction.empty() && !is_active_reaction(td_, reaction)) {
+    return promise.set_error(Status::Error(400, "Invalid reaction specified"));
+  }
+
+  if (m->reactions == nullptr) {
+    if (reaction.empty()) {
+      return promise.set_value(Unit());
+    }
+
+    m->reactions = make_unique<MessageReactions>();
+  }
+
+  bool is_found = false;
+  for (auto it = m->reactions->reactions_.begin(); it != m->reactions->reactions_.end();) {
+    auto &message_reaction = *it;
+    if (message_reaction.is_chosen()) {
+      if (message_reaction.get_reaction() == reaction) {
+        return promise.set_value(Unit());
+      }
+      message_reaction.set_is_chosen(false);
+      if (message_reaction.is_empty()) {
+        it = m->reactions->reactions_.erase(it);
+        continue;
+      }
+    } else {
+      if (message_reaction.get_reaction() == reaction) {
+        message_reaction.set_is_chosen(true);
+        is_found = true;
+      }
+    }
+
+    ++it;
+  }
+  // m->reactions->has_pending_reaction_ = true;
+  if (!is_found && !reaction.empty()) {
+    // TODO place to the correct position
+    vector<DialogId> recent_chooser_dialog_ids;
+    if (!is_broadcast_channel(dialog_id)) {
+      recent_chooser_dialog_ids.push_back(get_my_dialog_id());
+    }
+    m->reactions->reactions_.emplace_back(reaction, 1, true, std::move(recent_chooser_dialog_ids), Auto());
+  }
+
+  send_update_message_interaction_info(dialog_id, m);
+  on_message_changed(d, m, true, "set_message_reaction");
+
+  ::td::set_message_reaction(td_, full_message_id, std::move(reaction), std::move(promise));
+}
+
 void MessagesManager::get_message_public_forwards(FullMessageId full_message_id, string offset, int32 limit,
                                                   Promise<td_api::object_ptr<td_api::foundMessages>> &&promise) {
   auto dc_id_promise = PromiseCreator::lambda([actor_id = actor_id(this), full_message_id, offset = std::move(offset),
diff --git a/td/telegram/MessagesManager.h b/td/telegram/MessagesManager.h
index ba7991372..c10a3a859 100644
--- a/td/telegram/MessagesManager.h
+++ b/td/telegram/MessagesManager.h
@@ -780,6 +780,8 @@ class MessagesManager final : public Actor {
   vector<MessageId> get_dialog_scheduled_messages(DialogId dialog_id, bool force, bool ignore_result,
                                                   Promise<Unit> &&promise);
 
+  void set_message_reaction(FullMessageId full_message_id, string reaction, Promise<Unit> &&promise);
+
   void get_message_public_forwards(FullMessageId full_message_id, string offset, int32 limit,
                                    Promise<td_api::object_ptr<td_api::foundMessages>> &&promise);
 
diff --git a/td/telegram/Td.cpp b/td/telegram/Td.cpp
index b893fd4ce..e44359170 100644
--- a/td/telegram/Td.cpp
+++ b/td/telegram/Td.cpp
@@ -5244,10 +5244,18 @@ void Td::on_request(uint64 id, const td_api::getChatScheduledMessages &request)
   CREATE_REQUEST(GetChatScheduledMessagesRequest, request.chat_id_);
 }
 
+void Td::on_request(uint64 id, td_api::setMessageReaction &request) {
+  CHECK_IS_USER();
+  CLEAN_INPUT_STRING(request.reaction_);
+  CREATE_OK_REQUEST_PROMISE();
+  messages_manager_->set_message_reaction({DialogId(request.chat_id_), MessageId(request.message_id_)},
+                                          std::move(request.reaction_), std::move(promise));
+}
+
 void Td::on_request(uint64 id, td_api::getMessageChosenReactions &request) {
   CHECK_IS_USER();
-  CLEAN_INPUT_STRING(request.offset_);
   CLEAN_INPUT_STRING(request.reaction_);
+  CLEAN_INPUT_STRING(request.offset_);
   CREATE_REQUEST_PROMISE();
   get_message_chosen_reactions(this, {DialogId(request.chat_id_), MessageId(request.message_id_)},
                                std::move(request.reaction_), std::move(request.offset_), request.limit_,
diff --git a/td/telegram/Td.h b/td/telegram/Td.h
index f624ab2d5..99d24ec8e 100644
--- a/td/telegram/Td.h
+++ b/td/telegram/Td.h
@@ -645,6 +645,8 @@ class Td final : public Actor {
 
   void on_request(uint64 id, const td_api::getChatScheduledMessages &request);
 
+  void on_request(uint64 id, td_api::setMessageReaction &request);
+
   void on_request(uint64 id, td_api::getMessageChosenReactions &request);
 
   void on_request(uint64 id, td_api::getMessagePublicForwards &request);
diff --git a/td/telegram/cli.cpp b/td/telegram/cli.cpp
index 1915b9d98..75c89bcac 100644
--- a/td/telegram/cli.cpp
+++ b/td/telegram/cli.cpp
@@ -2058,6 +2058,12 @@ class CliClient final : public Actor {
       ChatId chat_id;
       get_args(args, chat_id);
       send_request(td_api::make_object<td_api::getChatScheduledMessages>(chat_id));
+    } else if (op == "react") {
+      ChatId chat_id;
+      MessageId message_id;
+      string reaction;
+      get_args(args, chat_id, message_id, reaction);
+      send_request(td_api::make_object<td_api::setMessageReaction>(chat_id, message_id, reaction));
     } else if (op == "gmcr") {
       ChatId chat_id;
       MessageId message_id;