diff --git a/sys/netinet/ip_carp.c b/sys/netinet/ip_carp.c
--- a/sys/netinet/ip_carp.c
+++ b/sys/netinet/ip_carp.c
@@ -239,7 +239,7 @@
 SYSCTL_NODE(_net_inet, IPPROTO_CARP, carp, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
     "CARP");
 SYSCTL_PROC(_net_inet_carp, OID_AUTO, allow,
-    CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_MPSAFE,
+    CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE,
     &VNET_NAME(carp_allow), 0, carp_allow_sysctl, "I",
     "Accept incoming CARP packets");
 SYSCTL_PROC(_net_inet_carp, OID_AUTO, dscp,