Index: head/tests/sys/sys/Makefile
===================================================================
--- head/tests/sys/sys/Makefile	(revision 355054)
+++ head/tests/sys/sys/Makefile	(revision 355055)
@@ -1,9 +1,15 @@
 # $FreeBSD$
 
+.include <bsd.compiler.mk>
+
 TESTSDIR=	${TESTSBASE}/sys/sys
 
 ATF_TESTS_C=	arb_test bitstring_test qmath_test rb_test splay_test
 
 WARNS?=	5
+
+.if ${COMPILER_TYPE} == "gcc"
+CFLAGS.bitstring_test=	-fno-strict-overflow
+.endif
 
 .include <bsd.test.mk>