diff --git a/core/renderers/zelos/path_object.js b/core/renderers/zelos/path_object.js
index b2f7ba3c6..e840c4efa 100644
--- a/core/renderers/zelos/path_object.js
+++ b/core/renderers/zelos/path_object.js
@@ -85,6 +85,18 @@ Blockly.zelos.PathObject.prototype.setPath = function(pathString) {
   }
 };
 
+/**
+ * @override
+ */
+Blockly.zelos.PathObject.prototype.flipRTL = function() {
+  Blockly.zelos.PathObject.superClass_.flipRTL.call(this);
+  // Mirror each input outline path.
+  for (var i = 0, keys = Object.keys(this.outlines_),
+    key; (key = keys[i]); i++) {
+    this.outlines_[key].setAttribute('transform', 'scale(-1 1)');
+  }
+};
+
 /**
  * @override
  */