diff --git a/phpBB/includes/mcp/mcp_main.php b/phpBB/includes/mcp/mcp_main.php
index cb661ba5d5..ced9f83ce9 100644
--- a/phpBB/includes/mcp/mcp_main.php
+++ b/phpBB/includes/mcp/mcp_main.php
@@ -598,10 +598,9 @@ function mcp_move_topic($topic_ids)
 
 		$db->sql_transaction('begin');
 
-		$sql = 'SELECT topic_replies + 1 as topic_posts
+		$sql = 'SELECT SUM(topic_replies + 1) as topic_posts
 			FROM ' . TOPICS_TABLE . ' t
-			WHERE ' . $db->sql_in_set('t.topic_id', $topic_ids) . '
-			GROUP BY topic_posts';
+			WHERE ' . $db->sql_in_set('t.topic_id', $topic_ids);
 		$result = $db->sql_query($sql);
 		$row_data = $db->sql_fetchrow($result);
 		$db->sql_freeresult($result);