diff --git a/tests/sys/capsicum/Makefile b/tests/sys/capsicum/Makefile
--- a/tests/sys/capsicum/Makefile
+++ b/tests/sys/capsicum/Makefile
@@ -43,6 +43,12 @@
 NO_SHARED.$p=
 SRCS.$p=	mini-me.c
 .endfor
+.if ${MK_ASAN} != "no" || ${MK_UBSAN} != "no"
+# mini-me.o is linked into a static binary so we can't use sanitizers.
+# Note: We have to set CFLAGS here since it will be built as part of
+# _PROGS_COMMON_OBJS and therefore NO_SHARED.$p does not disable ASAN/UBSAN.
+CFLAGS.mini-me.c+=	-fno-sanitize=address -fno-sanitize=undefined
+.endif
 
 BINDIR=	${TESTSDIR}
 
diff --git a/usr.sbin/rpcbind/tests/Makefile b/usr.sbin/rpcbind/tests/Makefile
--- a/usr.sbin/rpcbind/tests/Makefile
+++ b/usr.sbin/rpcbind/tests/Makefile
@@ -14,4 +14,12 @@
 
 WARNS?=	3
 
+.if ${MK_ASAN} != "no"
+# Work around "error: duplicate symbol: getifaddrs" when building with ASAN.
+# The ASAN interceptors also define getifaddrs, but we want to prefer the local
+# stub symbol here, so using a shared sanitizer runtime moves the local
+# definition first in the symbol resolution order.
+LDFLAGS+=-shared-libasan
+.endif
+
 .include <bsd.test.mk>