diff --git a/phpBB/includes/functions_display.php b/phpBB/includes/functions_display.php
index 0c5b80c609..1f45d5e8e1 100644
--- a/phpBB/includes/functions_display.php
+++ b/phpBB/includes/functions_display.php
@@ -403,7 +403,7 @@ function display_forums($root_data = '', $display_moderators = true, $return_mod
 		}
 		else
 		{
-			$last_post_subject = $last_post_time = $last_post_url = '';
+			$last_post_subject = $last_post_time = $last_post_url = $last_post_subject_truncated = '';
 		}
 
 		// Output moderator listing ... if applicable