diff --git a/core/flyout_button.js b/core/flyout_button.js
index 13ce2b1a6..eedeceffe 100644
--- a/core/flyout_button.js
+++ b/core/flyout_button.js
@@ -179,8 +179,8 @@ Blockly.FlyoutButton.prototype.createDom = function() {
 
   this.updateTransform_();
 
-  this.mouseUpWrapper_ = Blockly.bindEventWithChecks_(this.svgGroup_, 'mouseup',
-      this, this.onMouseUp_);
+  this.onMouseUpWrapper_ = Blockly.bindEventWithChecks_(
+      this.svgGroup_, 'mouseup', this, this.onMouseUp_);
   return this.svgGroup_;
 };