diff --git a/td/generate/scheme/td_api.tl b/td/generate/scheme/td_api.tl
index e55285342..a834e664f 100644
--- a/td/generate/scheme/td_api.tl
+++ b/td/generate/scheme/td_api.tl
@@ -3540,7 +3540,8 @@ setChatPermissions chat_id:int53 permissions:chatPermissions = Ok;
 //@description Changes the draft message in a chat @chat_id Chat identifier @draft_message New draft message; may be null
 setChatDraftMessage chat_id:int53 draft_message:draftMessage = Ok;
 
-//@description Changes the notification settings of a chat. Notification settings of a chat with the current user (Saved Messages) can't be changed @chat_id Chat identifier @notification_settings New notification settings for the chat
+//@description Changes the notification settings of a chat. Notification settings of a chat with the current user (Saved Messages) can't be changed
+//@chat_id Chat identifier @notification_settings New notification settings for the chat. If the chat is muted for more than 1 week, it is considered to be muted forever
 setChatNotificationSettings chat_id:int53 notification_settings:chatNotificationSettings = Ok;
 
 //@description Changes the pinned state of a chat. You can pin up to GetOption("pinned_chat_count_max")/GetOption("pinned_archived_chat_count_max") non-secret chats and the same number of secret chats in the main/archive chat list @chat_id Chat identifier @is_pinned New value of is_pinned
diff --git a/td/telegram/NotificationSettings.cpp b/td/telegram/NotificationSettings.cpp
index bfaa1164a..06439bc76 100644
--- a/td/telegram/NotificationSettings.cpp
+++ b/td/telegram/NotificationSettings.cpp
@@ -120,8 +120,9 @@ static int32 get_mute_until(int32 mute_for) {
     return 0;
   }
 
+  const int32 MAX_PRECISE_MUTE_FOR = 7 * 86400;
   int32 current_time = G()->unix_time();
-  if (mute_for >= std::numeric_limits<int32>::max() - current_time) {
+  if (mute_for > MAX_PRECISE_MUTE_FOR || mute_for >= std::numeric_limits<int32>::max() - current_time) {
     return std::numeric_limits<int32>::max();
   }
   return mute_for + current_time;