diff --git a/core/xml.js b/core/xml.js
index 5ac15c38f..7af92dfb3 100644
--- a/core/xml.js
+++ b/core/xml.js
@@ -713,7 +713,7 @@ Blockly.Xml.domToBlockHeadless_ = function(xmlBlock, workspace) {
   }
   var disabled = xmlBlock.getAttribute('disabled');
   if (disabled) {
-    block.setDisabled(disabled == 'true');
+    block.setDisabled(disabled == 'true' || disabled == 'disabled');
   }
   var deletable = xmlBlock.getAttribute('deletable');
   if (deletable) {