diff --git a/td/generate/scheme/td_api.tl b/td/generate/scheme/td_api.tl
index 8ce34dd37..e286c2ec7 100644
--- a/td/generate/scheme/td_api.tl
+++ b/td/generate/scheme/td_api.tl
@@ -7358,7 +7358,7 @@ toggleSupergroupHasHiddenMembers supergroup_id:int53 has_hidden_members:Bool = O
 //@has_aggressive_anti_spam_enabled The new value of has_aggressive_anti_spam_enabled
 toggleSupergroupHasAggressiveAntiSpamEnabled supergroup_id:int53 has_aggressive_anti_spam_enabled:Bool = Ok;
 
-//@description Toggles whether the supergroup is a forum; requires owner privileges in the supergroup @supergroup_id Identifier of the supergroup @is_forum New value of is_forum. A supergroup can be converted to a forum, only if it has at least getOption("forum_member_count_min") members
+//@description Toggles whether the supergroup is a forum; requires owner privileges in the supergroup. Discussion supergroups can't be converted to forums @supergroup_id Identifier of the supergroup @is_forum New value of is_forum
 toggleSupergroupIsForum supergroup_id:int53 is_forum:Bool = Ok;
 
 //@description Upgrades supergroup to a broadcast group; requires owner privileges in the supergroup @supergroup_id Identifier of the supergroup
diff --git a/td/telegram/ConfigManager.cpp b/td/telegram/ConfigManager.cpp
index 4f75a6a27..195d91c37 100644
--- a/td/telegram/ConfigManager.cpp
+++ b/td/telegram/ConfigManager.cpp
@@ -1492,7 +1492,6 @@ void ConfigManager::process_app_config(tl_object_ptr<telegram_api::JSONValue> &c
   bool is_premium_available = false;
   int32 stickers_premium_by_emoji_num = 0;
   int32 stickers_normal_by_emoji_per_premium_num = 2;
-  int32 forum_upgrade_participants_min = 200;
   int32 telegram_antispam_group_size_min = 100;
   int32 topics_pinned_limit = -1;
   vector<string> fragment_prefixes;
@@ -1500,9 +1499,10 @@ void ConfigManager::process_app_config(tl_object_ptr<telegram_api::JSONValue> &c
     for (auto &key_value : static_cast<telegram_api::jsonObject *>(config.get())->value_) {
       Slice key = key_value->key_;
       telegram_api::JSONValue *value = key_value->value_.get();
-      if (key == "default_emoji_statuses_stickerset_id" || key == "getfile_experimental_params" ||
-          key == "message_animated_emoji_max" || key == "reactions_in_chat_max" || key == "stickers_emoji_cache_time" ||
-          key == "test" || key == "upload_max_fileparts_default" || key == "upload_max_fileparts_premium" ||
+      if (key == "default_emoji_statuses_stickerset_id" || key == "forum_upgrade_participants_min" ||
+          key == "getfile_experimental_params" || key == "message_animated_emoji_max" ||
+          key == "reactions_in_chat_max" || key == "stickers_emoji_cache_time" || key == "test" ||
+          key == "upload_max_fileparts_default" || key == "upload_max_fileparts_premium" ||
           key == "wallet_blockchain_name" || key == "wallet_config" || key == "wallet_enabled") {
         continue;
       }
@@ -1843,10 +1843,6 @@ void ConfigManager::process_app_config(tl_object_ptr<telegram_api::JSONValue> &c
         G()->set_option_integer(key, setting_value);
         continue;
       }
-      if (key == "forum_upgrade_participants_min") {
-        forum_upgrade_participants_min = get_json_value_int(std::move(key_value->value_), key);
-        continue;
-      }
       if (key == "telegram_antispam_user_id") {
         auto setting_value = get_json_value_long(std::move(key_value->value_), key);
         G()->set_option_integer("anti_spam_bot_user_id", setting_value);
@@ -1970,9 +1966,6 @@ void ConfigManager::process_app_config(tl_object_ptr<telegram_api::JSONValue> &c
   } else {
     options.set_option_integer("reactions_uniq_max", reactions_uniq_max);
   }
-  if (forum_upgrade_participants_min >= 0) {
-    options.set_option_integer("forum_member_count_min", forum_upgrade_participants_min);
-  }
   if (telegram_antispam_group_size_min >= 0) {
     options.set_option_integer("aggressive_anti_spam_supergroup_member_count_min", telegram_antispam_group_size_min);
   }
diff --git a/td/telegram/OptionManager.cpp b/td/telegram/OptionManager.cpp
index 25aedd0cd..d89c1b84e 100644
--- a/td/telegram/OptionManager.cpp
+++ b/td/telegram/OptionManager.cpp
@@ -112,9 +112,6 @@ OptionManager::OptionManager(Td *td)
   if (!have_option("chat_filter_chosen_chat_count_max")) {
     set_option_integer("chat_filter_chosen_chat_count_max", G()->is_test_dc() ? 5 : 100);
   }
-  if (!have_option("forum_member_count_min")) {
-    set_option_integer("forum_member_count_min", G()->is_test_dc() ? 3 : 100);
-  }
   if (!have_option("aggressive_anti_spam_supergroup_member_count_min")) {
     set_option_integer("aggressive_anti_spam_supergroup_member_count_min", G()->is_test_dc() ? 1 : 100);
   }
@@ -122,6 +119,7 @@ OptionManager::OptionManager(Td *td)
     set_option_integer("pinned_forum_topic_count_max", G()->is_test_dc() ? 3 : 5);
   }
 
+  set_option_empty("forum_member_count_min");
   set_option_empty("themed_emoji_statuses_sticker_set_id");
   set_option_empty("themed_premium_statuses_sticker_set_id");
 }