diff --git a/src/test/html/content/test_navigator.html b/src/test/html/content/test_navigator.html
index c7809f36895..8ec7fc0ab3e 100644
--- a/src/test/html/content/test_navigator.html
+++ b/src/test/html/content/test_navigator.html
@@ -18,9 +18,9 @@ is(nav.taintEnabled(), false);
 is(nav.appName, "Netscape");
 is(nav.appCodeName, "Mozilla");
 // todo
-is(nav.appVersion, null);
-is(nav.platform, null);
-is(nav.userAgent, null);
+is(nav.appVersion, "");
+is(nav.platform, "");
+is(nav.userAgent, "");
 is(nav.language, null);
 is(nav.onLine, true);
 finish();