diff --git a/sbin/dhclient/tests/Makefile b/sbin/dhclient/tests/Makefile
index 790d3dbcccce..d366778f3bbc 100644
--- a/sbin/dhclient/tests/Makefile
+++ b/sbin/dhclient/tests/Makefile
@@ -1,16 +1,19 @@
 # $FreeBSD$
 
 .PATH:	${.CURDIR:H}
 
 ATF_TESTS_SH=	pcp
 
+# Tests assign a common IP address.
+TEST_METADATA.pcp+=	is_exclusive=true
+
 PLAIN_TESTS_C=				option-domain-search_test
 SRCS.option-domain-search_test=		alloc.c convert.c hash.c options.c \
 					tables.c parse.c conflex.c tree.c fake.c \
 					option-domain-search.c
 CFLAGS.option-domain-search_test+=	-I${.CURDIR:H}
 LIBADD.option-domain-search_test=	util
 
 WARNS?=	2
 
 .include <bsd.test.mk>