diff --git a/Makefile.pre.in b/Makefile.pre.in
index 380f914..e20946c 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -852,7 +852,7 @@
 		importlib/test/import_ importlib/test/source \
 		setuptools setuptools/command setuptools/tests setuptools.egg-info \
 		multiprocessing multiprocessing/dummy \
-		unittest \
+		unittest unittest/test \
 		curses pydoc_data $(MACHDEPS)
 libinstall:	build_all $(srcdir)/Lib/$(PLATDIR)
 	@for i in $(SCRIPTDIR) $(LIBDEST); \