diff --git a/examples/libraries/gridTool.js b/examples/libraries/gridTool.js
index 95c4ae19f3..79ec70b13f 100644
--- a/examples/libraries/gridTool.js
+++ b/examples/libraries/gridTool.js
@@ -475,9 +475,6 @@ GridTool = function(opts) {
         return false;
     };
 
-    that.mouseReleaseEvent = function(event) {
-    };
-
     Script.scriptEnding.connect(function() {
         for (var i = 0; i < allOverlays.length; i++) {
             Overlays.deleteOverlay(allOverlays[i]);