diff --git a/Makefile.pre.in b/Makefile.pre.in
index 6ca11f080dc..42a7545be7e 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -2164,6 +2164,7 @@ LIBSUBDIRS=	asyncio \
 		json \
 		logging \
 		multiprocessing multiprocessing/dummy \
+		pathlib \
 		pydoc_data \
 		re \
 		site-packages \