diff --git a/Makefile.pre.in b/Makefile.pre.in
index f128444b98594e1..3137d9306c2c427 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -1439,6 +1439,7 @@ LIBSUBDIRS=	tkinter tkinter/test tkinter/test/test_tkinter \
 		test/test_importlib/namespace_pkgs/project3 \
 		test/test_importlib/namespace_pkgs/project3/parent \
 		test/test_importlib/namespace_pkgs/project3/parent/child \
+		test/test_importlib/partial \
 		test/test_importlib/source \
 		test/test_importlib/zipdata01 \
 		test/test_importlib/zipdata02 \