diff --git a/tests/sys/geom/class/gate/Makefile b/tests/sys/geom/class/gate/Makefile
index 417fa7dfd197..600cef0b6bca 100644
--- a/tests/sys/geom/class/gate/Makefile
+++ b/tests/sys/geom/class/gate/Makefile
@@ -6,4 +6,7 @@ TESTSDIR=	${TESTSBASE}/sys/geom/class/${.CURDIR:T}
 
 ATF_TESTS_SH+=	ggate_test
 
+# Tests listen on the same port.
+TEST_METADATA.ggate_test+= is_exclusive=true
+
 .include <bsd.test.mk>