diff --git a/user/test/com/google/gwt/typedarrays/client/ClientSupportTest.java b/user/test/com/google/gwt/typedarrays/client/ClientSupportTest.java
index 8e879ef..bc45b14 100644
--- a/user/test/com/google/gwt/typedarrays/client/ClientSupportTest.java
+++ b/user/test/com/google/gwt/typedarrays/client/ClientSupportTest.java
@@ -68,6 +68,6 @@
   }-*/;
 
   private static native int getIeDocumentMode() /*-{
-    return $doc.documentMode;
+    return $doc.documentMode || 0;
   }-*/;
 }