diff --git a/core/block.js b/core/block.js
index 94ccbeb9c..c7faf8525 100644
--- a/core/block.js
+++ b/core/block.js
@@ -1128,7 +1128,7 @@ Blockly.Block.prototype.getFieldValue = function(name) {
  */
 Blockly.Block.prototype.setFieldValue = function(newValue, name) {
   if (typeof name === "undefined") {
-    throw Error("Call to Blockly.Block.prototype.setFieldValue without " + 
+    throw Error("Call to Blockly.Block.prototype.setFieldValue without " +
         "required second argument of field name.");
   }
   var field = this.getField(name);