diff --git a/phpBB/includes/mcp/mcp_post.php b/phpBB/includes/mcp/mcp_post.php
index 6f5f719593..42985b3c79 100644
--- a/phpBB/includes/mcp/mcp_post.php
+++ b/phpBB/includes/mcp/mcp_post.php
@@ -372,7 +372,7 @@ function mcp_post_details($id, $mode, $action)
 
 		if (!$lookup_all)
 		{
-			$template->assign_var('U_LOOKUP_ALL', "$url&i=main&mode=post_details&rdns=all");
+			$template->assign_var('U_LOOKUP_ALL', $base_url . '&rdns=all');
 		}
 
 		$num_users = false;