diff --git a/contrib/check-config.sh b/contrib/check-config.sh
index 11b525c184..825a00e505 100755
--- a/contrib/check-config.sh
+++ b/contrib/check-config.sh
@@ -182,6 +182,7 @@ flags=(
 	NAMESPACES {NET,PID,IPC,UTS}_NS
 	DEVPTS_MULTIPLE_INSTANCES
 	CGROUPS CGROUP_CPUACCT CGROUP_DEVICE CGROUP_FREEZER CGROUP_SCHED CPUSETS MEMCG
+	CONFIG_KEYS
 	MACVLAN VETH BRIDGE BRIDGE_NETFILTER
 	NF_NAT_IPV4 IP_NF_FILTER IP_NF_TARGET_MASQUERADE
 	NETFILTER_XT_MATCH_{ADDRTYPE,CONNTRACK}