diff --git a/dom/tests/mochitest/ajax/offline/Makefile.in b/dom/tests/mochitest/ajax/offline/Makefile.in
index a8ea2b458d4..e8679d1ea80 100644
--- a/dom/tests/mochitest/ajax/offline/Makefile.in
+++ b/dom/tests/mochitest/ajax/offline/Makefile.in
@@ -59,7 +59,6 @@ _TEST_FILES	= \
 	test_changingManifest.html \
 	test_refetchManifest.html \
 	test_offlineIFrame.html \
-	test_offlineMode.html \
 	test_bug445544.html \
 	test_bug460353.html \
 	test_bug474696.html \
@@ -124,5 +123,7 @@ _TEST_FILES	= \
 	jupiter.jpg \
 	$(NULL)
 
+# test_offlineMode.html disabled due to bug 656943
+
 libs::	$(_TEST_FILES)
 	$(INSTALL) $(foreach f,$^,"$f") $(DEPTH)/_tests/testing/mochitest/tests/$(relativesrcdir)