diff --git a/accessible/tests/mochitest/elm/test_HTMLSpec.html b/accessible/tests/mochitest/elm/test_HTMLSpec.html
index d8d23e28633..a3b7c5911f8 100644
--- a/accessible/tests/mochitest/elm/test_HTMLSpec.html
+++ b/accessible/tests/mochitest/elm/test_HTMLSpec.html
@@ -374,7 +374,7 @@
       //////////////////////////////////////////////////////////////////////////
       // HTML:details
 
-      todo(isAccessible("details"), "details element is not accessible");
+      ok(isAccessible("details"), "details element is not accessible");
 
       //////////////////////////////////////////////////////////////////////////
       // HTML:dfn contained by paragraph