diff --git a/share/mk/bsd.test.mk b/share/mk/bsd.test.mk
index 19a230512db..b204a3c24ff 100644
--- a/share/mk/bsd.test.mk
+++ b/share/mk/bsd.test.mk
@@ -55,7 +55,7 @@ _TESTS=
 .include <tap.test.mk>
 
 .for ts in ${TESTS_SUBDIRS}
-.if empty(SUBDIR:N${ts})
+.if empty(SUBDIR:M${ts})
 SUBDIR+= ${ts}
 .endif
 .endfor