diff --git a/public/js/icinga/ui.js b/public/js/icinga/ui.js
index 4135f1516..46e8d2c0d 100644
--- a/public/js/icinga/ui.js
+++ b/public/js/icinga/ui.js
@@ -354,6 +354,9 @@
         },
 
         refreshDebug: function () {
+            if (! this.debug) {
+                return;
+            }
 
             var size = this.getDefaultFontSize().toString();
             var winWidth = $( window ).width();