diff --git a/modules/plugin/test/mochitest/Makefile.in b/modules/plugin/test/mochitest/Makefile.in
index 9d5782b6fb1..5c9ee77a071 100644
--- a/modules/plugin/test/mochitest/Makefile.in
+++ b/modules/plugin/test/mochitest/Makefile.in
@@ -65,9 +65,14 @@ _MOCHITEST_FILES = \
 		test_pluginstream_poststream.html \
 		test_pluginstream_seek.html \
 		test_pluginstream_newstream.html \
-		test_windowed_invalidate.html \
 		$(NULL)
 
+ifeq ($(OS_ARCH),WINNT)
+_MOCHITEST_FILES += \
+ 		test_windowed_invalidate.html \
+        $(NULL)
+endif
+
 _MOCHICHROME_FILES = \
 		test_bug479979.xul \
 		test_npruntime.xul   \