diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index f066781be3c8..10d2bdce686e 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -1278,7 +1278,7 @@ static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
 	return err;
 }
 
-#if defined(CONFIG_IPDDP) || defined(CONFIG_IPDDP_MODULE)
+#if IS_ENABLED(CONFIG_IPDDP)
 static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
 {
 	return skb->data[12] == 22;