diff --git a/sys/modules/tests/Makefile b/sys/modules/tests/Makefile
index d1cb74323bb6..8b5bf36f63fc 100644
--- a/sys/modules/tests/Makefile
+++ b/sys/modules/tests/Makefile
@@ -4,4 +4,6 @@ SUBDIR+=	framework
 SUBDIR+=	.WAIT
 SUBDIR+=	callout_test
 
+SUBDIR_PARALLEL=
+
 .include <bsd.subdir.mk>