diff --git a/net/bridge/netfilter/ebt_log.c b/net/bridge/netfilter/ebt_log.c
index d159c92cca84..466ed3440b74 100644
--- a/net/bridge/netfilter/ebt_log.c
+++ b/net/bridge/netfilter/ebt_log.c
@@ -168,7 +168,7 @@ static void ebt_log(const struct sk_buff *skb, unsigned int hooknr,
 
 	if (info->bitmask & EBT_LOG_NFLOG)
 		nf_log_packet(PF_BRIDGE, hooknr, skb, in, out, &li,
-		              info->prefix);
+		              "%s", info->prefix);
 	else
 		ebt_log_packet(PF_BRIDGE, hooknr, skb, in, out, &li,
 		               info->prefix);
diff --git a/net/ipv4/netfilter/ipt_LOG.c b/net/ipv4/netfilter/ipt_LOG.c
index 39fd4c2a2386..b98f7b08b084 100644
--- a/net/ipv4/netfilter/ipt_LOG.c
+++ b/net/ipv4/netfilter/ipt_LOG.c
@@ -428,7 +428,7 @@ ipt_log_target(struct sk_buff **pskb,
 
 	if (loginfo->logflags & IPT_LOG_NFLOG)
 		nf_log_packet(PF_INET, hooknum, *pskb, in, out, &li,
-		              loginfo->prefix);
+		              "%s", loginfo->prefix);
 	else
 		ipt_log_packet(PF_INET, hooknum, *pskb, in, out, &li,
 		               loginfo->prefix);
diff --git a/net/ipv6/netfilter/ip6t_LOG.c b/net/ipv6/netfilter/ip6t_LOG.c
index a96c0de14b00..73c6300109d6 100644
--- a/net/ipv6/netfilter/ip6t_LOG.c
+++ b/net/ipv6/netfilter/ip6t_LOG.c
@@ -439,7 +439,7 @@ ip6t_log_target(struct sk_buff **pskb,
 
 	if (loginfo->logflags & IP6T_LOG_NFLOG)
 		nf_log_packet(PF_INET6, hooknum, *pskb, in, out, &li,
-		              loginfo->prefix);
+		              "%s", loginfo->prefix);
 	else
 		ip6t_log_packet(PF_INET6, hooknum, *pskb, in, out, &li,
 		                loginfo->prefix);