diff --git a/modules/ModuleBuilder/javascript/studio2.js b/modules/ModuleBuilder/javascript/studio2.js
index 4767e10c01c..430d8357219 100755
--- a/modules/ModuleBuilder/javascript/studio2.js
+++ b/modules/ModuleBuilder/javascript/studio2.js
@@ -193,7 +193,7 @@ Studio2 = {
 		if (!Dom.get('panels'))
             return;
         var body = document.getElementById('mbtabs');
-        var targetHeight =  body.clientHeight - (Dom.getY('panels') - Dom.getY(body)) - 32;
+        var targetHeight =  body.clientHeight - (Dom.getY('toolbox') - Dom.getY(body)) - 32;
 		if (Studio2.isIE) targetHeight -= 10;
 		Dom.setStyle('panels', "height", targetHeight + "px");
 		Dom.setStyle('panels', "width" , ((Studio2.fieldwidth * 2) + 112) + "px");