diff --git a/mail/app/Makefile.in b/mail/app/Makefile.in
index c06b60c308..38d6d3c6fb 100644
--- a/mail/app/Makefile.in
+++ b/mail/app/Makefile.in
@@ -396,13 +396,3 @@ libs::
 	if test -f $(TEST_COOKIE_HEADER_FILE); then $(RM) $(TEST_COOKIE_HEADER_FILE); echo "function run_test() {dump('disabled for TB for bug 431125');}" >$(TEST_COOKIE_HEADER_FILE); fi;
 	$(RM) $(DIST)/bin/TestCookie
 	if test -f $(DIST)/bin/TestTArray; then cp $(DIST)/bin/TestTArray $(DIST)/bin/TestCookie; fi;
-
-ifneq (,$(filter mac cocoa,$(MOZ_WIDGET_TOOLKIT)))
-
-TEST_PUNYCODE_FILE=$(DIST)/../_tests/xpcshell-simple/test_uriloader_exthandler/unit/test_punycodeURIs.js
-
-# Disabled due to bug 447999
-libs::
-	if test -f $(TEST_PUNYCODE_FILE); then $(RM) $(TEST_PUNYCODE_FILE); echo "function run_test() {dump('disabled for bug 447999');}" >$(TEST_PUNYCODE_FILE); fi;
-
-endif