--- a/test-suite/idltest/index.html	Thu Apr 25 09:40:53 2013 +0200
+++ b/test-suite/idltest/index.html	Thu Apr 25 09:42:04 2013 +0200
@@ -109,6 +109,12 @@
       writable: false,
       enumerable: false
     });
+    Object.defineProperty(JsonLdProcessor.prototype, 'constructor', {
+      writable: false,
+      enumerable: false,
+      configurable: false,
+      value: JsonLdProcessor
+    });
   }
 
   // Ensure that stringification tests are passed