diff --git a/include/net/ip.h b/include/net/ip.h
index e4f34bf49b86d5ec3181d6b85dbd983db15caf04..a711bafa62cee1352bbaca1ef09a8b74b10bec3e 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -340,7 +340,7 @@ void ipfrag_init(void);
 void ip_static_sysctl_init(void);
 
 #define IP4_REPLY_MARK(net, mark) \
-	((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
+	(READ_ONCE((net)->ipv4.sysctl_fwmark_reflect) ? (mark) : 0)
 
 static inline bool ip_is_fragment(const struct iphdr *iph)
 {