diff --git a/src/Makefile b/src/Makefile
index 2f31a2f20a7..fd601c47039 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -27,6 +27,7 @@ SUBDIRS = \
 	bin \
 	pl \
 	makefiles \
+	test/modules \
 	test/regress \
 	test/isolation \
 	test/perl
-- 
2.34.1