diff --git a/core/field_variable.js b/core/field_variable.js
index 36761760d..6a32ff61b 100644
--- a/core/field_variable.js
+++ b/core/field_variable.js
@@ -28,6 +28,7 @@ goog.provide('Blockly.FieldVariable');
 
 goog.require('Blockly.FieldDropdown');
 goog.require('Blockly.Msg');
+goog.require('Blockly.VariableModel');
 goog.require('Blockly.Variables');
 goog.require('goog.asserts');
 goog.require('goog.string');