diff --git a/net/can/raw.c b/net/can/raw.c
index db3152df..b5e8979 100644
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -411,7 +411,7 @@
 }
 
 static int raw_setsockopt(struct socket *sock, int level, int optname,
-			  char __user *optval, int optlen)
+			  char __user *optval, unsigned int optlen)
 {
 	struct sock *sk = sock->sk;
 	struct raw_sock *ro = raw_sk(sk);