diff --git a/core-overlay-layer.html b/core-overlay-layer.html
index 58a5bb5..1d11cf9 100644
--- a/core-overlay-layer.html
+++ b/core-overlay-layer.html
@@ -101,7 +101,7 @@
       }
       if (element.__parentNode) {
         var n = element.__nextElementSibling && element.__nextElementSibling 
-            === element.__parentNode ? element.__nextElementSibling : null;
+            !== element.__parentNode ? element.__nextElementSibling : null;
         element.__parentNode.insertBefore(element, n);
       }
     },