diff --git a/phpBB/includes/datetime.php b/phpBB/includes/datetime.php
index 12d04d5ca6..25da6401d7 100644
--- a/phpBB/includes/datetime.php
+++ b/phpBB/includes/datetime.php
@@ -97,6 +97,8 @@ class phpbb_datetime extends DateTime
 
 				$midnight	= $midnight->getTimestamp();
 
+				$day = false;
+
 				if ($timestamp > $midnight + 86400)
 				{
 					$day = 'TOMORROW';