diff --git a/src/core/display/DisplayObject.js b/src/core/display/DisplayObject.js
index decb42a..c306d05 100644
--- a/src/core/display/DisplayObject.js
+++ b/src/core/display/DisplayObject.js
@@ -605,6 +605,7 @@
         if (this._mask)
         {
             this._mask.renderable = true;
+            this._mask.isMask = false;
         }
 
         this._mask = value;
@@ -612,6 +613,7 @@
         if (this._mask)
         {
             this._mask.renderable = false;
+            this._mask.isMask = true;
         }
     }