diff --git a/Makefile.pre.in b/Makefile.pre.in
index 144c1f8629bcd5..df791a88eeeb2e 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -1187,6 +1187,7 @@ LIBSUBDIRS=	tkinter tkinter/test tkinter/test/test_tkinter \
 		test/test_import/data \
 		test/test_import/data/circular_imports \
 		test/test_import/data/circular_imports/subpkg \
+		test/test_import/data/package2 \
 		test/test_importlib/namespace_pkgs \
 		test/test_importlib/namespace_pkgs/both_portions \
 		test/test_importlib/namespace_pkgs/both_portions/foo \