diff --git a/net/core/secure_seq.c b/net/core/secure_seq.c
index 3f1ec15..8d9d05e 100644
--- a/net/core/secure_seq.c
+++ b/net/core/secure_seq.c
@@ -10,6 +10,7 @@
 
 #include <net/secure_seq.h>
 
+#if IS_ENABLED(CONFIG_IPV6) || IS_ENABLED(CONFIG_INET)
 #define NET_SECRET_SIZE (MD5_MESSAGE_BYTES / 4)
 
 static u32 net_secret[NET_SECRET_SIZE] ____cacheline_aligned;
@@ -29,6 +30,7 @@
 		cmpxchg(&net_secret[--i], 0, tmp);
 	}
 }
+#endif
 
 #ifdef CONFIG_INET
 static u32 seq_scale(u32 seq)