diff --git a/td/telegram/NotificationSettings.cpp b/td/telegram/NotificationSettings.cpp
index 000cb1e64..bfaa1164a 100644
--- a/td/telegram/NotificationSettings.cpp
+++ b/td/telegram/NotificationSettings.cpp
@@ -115,6 +115,18 @@ NotificationSettingsScope get_notification_settings_scope(
   }
 }
 
+static int32 get_mute_until(int32 mute_for) {
+  if (mute_for <= 0) {
+    return 0;
+  }
+
+  int32 current_time = G()->unix_time();
+  if (mute_for >= std::numeric_limits<int32>::max() - current_time) {
+    return std::numeric_limits<int32>::max();
+  }
+  return mute_for + current_time;
+}
+
 Result<DialogNotificationSettings> get_dialog_notification_settings(
     td_api::object_ptr<td_api::chatNotificationSettings> &&notification_settings, bool old_silent_send_message) {
   if (notification_settings == nullptr) {
@@ -127,18 +139,8 @@ Result<DialogNotificationSettings> get_dialog_notification_settings(
     notification_settings->sound_ = "default";
   }
 
-  int32 current_time = G()->unix_time();
-  if (notification_settings->mute_for_ > std::numeric_limits<int32>::max() - current_time) {
-    notification_settings->mute_for_ = std::numeric_limits<int32>::max() - current_time;
-  }
-
-  int32 mute_until;
-  if (notification_settings->use_default_mute_for_ || notification_settings->mute_for_ <= 0) {
-    mute_until = 0;
-  } else {
-    mute_until = notification_settings->mute_for_ + current_time;
-  }
-
+  int32 mute_until =
+      notification_settings->use_default_mute_for_ ? 0 : get_mute_until(notification_settings->mute_for_);
   return DialogNotificationSettings(notification_settings->use_default_mute_for_, mute_until,
                                     notification_settings->use_default_sound_, std::move(notification_settings->sound_),
                                     notification_settings->use_default_show_preview_,
@@ -161,18 +163,7 @@ Result<ScopeNotificationSettings> get_scope_notification_settings(
     notification_settings->sound_ = "default";
   }
 
-  int32 current_time = G()->unix_time();
-  if (notification_settings->mute_for_ > std::numeric_limits<int32>::max() - current_time) {
-    notification_settings->mute_for_ = std::numeric_limits<int32>::max() - current_time;
-  }
-
-  int32 mute_until;
-  if (notification_settings->mute_for_ <= 0) {
-    mute_until = 0;
-  } else {
-    mute_until = notification_settings->mute_for_ + current_time;
-  }
-
+  auto mute_until = get_mute_until(notification_settings->mute_for_);
   return ScopeNotificationSettings(mute_until, std::move(notification_settings->sound_),
                                    notification_settings->show_preview_,
                                    notification_settings->disable_pinned_message_notifications_,