diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c
index 6d16e1ab1a8ab..eef0e3f2f25b0 100644
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -306,7 +306,7 @@ static int nr_setsockopt(struct socket *sock, int level, int optname,
 	if (optlen < sizeof(unsigned int))
 		return -EINVAL;
 
-	if (copy_from_sockptr(&opt, optval, sizeof(unsigned int)))
+	if (copy_from_sockptr(&opt, optval, sizeof(unsigned long)))
 		return -EFAULT;
 
 	switch (optname) {