diff --git a/blocks/procedures.js b/blocks/procedures.js
index 4a89582b4..d918d92d6 100644
--- a/blocks/procedures.js
+++ b/blocks/procedures.js
@@ -805,6 +805,14 @@ Blockly.Blocks['procedures_callnoreturn'] = {
     }
     this.setProcedureParameters_(args, paramIds);
   },
+  /**
+   * Return all variables referenced by this block.
+   * @return {!Array.<string>} List of variable names.
+   * @this {Blockly.Block}
+   */
+  getVars: function() {
+    return this.arguments_;
+  },
   /**
    * Return all variables referenced by this block.
    * @return {!Array.<!Blockly.VariableModel>} List of variable models.
@@ -959,6 +967,7 @@ Blockly.Blocks['procedures_callreturn'] = {
   updateShape_: Blockly.Blocks['procedures_callnoreturn'].updateShape_,
   mutationToDom: Blockly.Blocks['procedures_callnoreturn'].mutationToDom,
   domToMutation: Blockly.Blocks['procedures_callnoreturn'].domToMutation,
+  getVars: Blockly.Blocks['procedures_callnoreturn'].getVars,
   getVarModels: Blockly.Blocks['procedures_callnoreturn'].getVarModels,
   onchange: Blockly.Blocks['procedures_callnoreturn'].onchange,
   customContextMenu: