diff --git src/bp-activity/bp-activity-functions.php src/bp-activity/bp-activity-functions.php
index 9e5ab42..3e7ac28 100644
--- src/bp-activity/bp-activity-functions.php
+++ src/bp-activity/bp-activity-functions.php
@@ -132,6 +132,15 @@ function bp_activity_find_mentions( $content ) {
 function bp_activity_clear_new_mentions( $user_id ) {
 	bp_delete_user_meta( $user_id, 'bp_new_mention_count' );
 	bp_delete_user_meta( $user_id, 'bp_new_mentions'      );
+
+	/**
+	 * Fires once mentions has been cleared for a given user.
+	 *
+	 * @since  ?
+	 *
+	 * @param  int $user_id
+	 */
+	do_action( 'bp_activity_clear_new_mentions', $user_id );
 }
 
 /**
diff --git src/bp-activity/bp-activity-notifications.php src/bp-activity/bp-activity-notifications.php
index e2b233c..542726c 100644
--- src/bp-activity/bp-activity-notifications.php
+++ src/bp-activity/bp-activity-notifications.php
@@ -501,19 +501,18 @@ add_action( 'bp_activity_sent_mention_email', 'bp_activity_at_mention_add_notifi
  *
  * @uses bp_notifications_mark_all_notifications_by_type()
  */
-function bp_activity_remove_screen_notifications() {
+function bp_activity_remove_screen_notifications( $user_id = 0 ) {
 	if ( ! bp_is_active( 'notifications' ) ) {
 		return;
 	}
 
 	// Only mark read if you're looking at your own mentions.
-	if ( ! bp_is_my_profile() ) {
-		return;
+	if ( bp_is_my_profile() || (int) $user_id === (int) bp_loggedin_user_id() ) {
+		bp_notifications_mark_notifications_by_type( bp_loggedin_user_id(), buddypress()->activity->id, 'new_at_mention' );
 	}
-
-	bp_notifications_mark_notifications_by_type( bp_loggedin_user_id(), buddypress()->activity->id, 'new_at_mention' );
 }
-add_action( 'bp_activity_screen_mentions', 'bp_activity_remove_screen_notifications' );
+add_action( 'bp_activity_screen_mentions', 'bp_activity_remove_screen_notifications', 10, 0 );
+add_action( 'bp_activity_clear_new_mentions', 'bp_activity_remove_screen_notifications', 10, 1 );
 
 /**
  * Mark at-mention notification as read when user visits the activity with the mention.