diff --git a/src/dom.js b/src/dom.js
index f3f6521..df61eb6 100644
--- a/src/dom.js
+++ b/src/dom.js
@@ -132,7 +132,9 @@
 
   // deliver queued delcarations
   scope.deliverDeclarations = function() {
-    scope.deliverDeclarations = null;
+    scope.deliverDeclarations = function() {
+     throw 'Attempt to load platform.js twice';
+    };
     return elementDeclarations;
   }