diff --git a/core/Requirements.php b/core/Requirements.php
index 6f6a02500..2cc9ef7a7 100644
--- a/core/Requirements.php
+++ b/core/Requirements.php
@@ -220,7 +220,7 @@ class Requirements {
 			Requirements::$css = array();
 			Requirements::$customScript = array();
 			Requirements::$customCSS = array();
-			Requirements::$customHeadTags = "";
+			Requirements::$customHeadTags = array();
 		}
 		
 	}