diff --git a/tests/playground.html b/tests/playground.html
index c94c05c2f98..4ac93f1ce5f 100644
--- a/tests/playground.html
+++ b/tests/playground.html
@@ -392,7 +392,7 @@
       }
     };
     console.time('Spaghetti serialization');
-    Blockly.serialization.load(obj, workspace);
+    Blockly.serialization.workspaces.load(obj, workspace);
     console.timeEnd('Spaghetti serialization');
   }
   var spaghettiJs = JSON.stringify({