diff --git a/Makefile.pre.in b/Makefile.pre.in
index 9211032cb81..c9aa13a7a0d 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -1221,7 +1221,7 @@ LIBSUBDIRS=	tkinter tkinter/test tkinter/test/test_tkinter \
 		importlib test/test_importlib test/test_importlib/builtin \
 		test/test_importlib/extension test/test_importlib/frozen \
 		test/test_importlib/import_ test/test_importlib/source \
-		test/test_tools test/test_warnings \
+		test/test_tools test/test_warnings test/test_warnings/data \
 		turtledemo \
 		multiprocessing multiprocessing/dummy \
 		unittest unittest/test unittest/test/testmock \