diff --git a/sys/netinet6/udp6_usrreq.c b/sys/netinet6/udp6_usrreq.c
index 81cea4d8036..c8e65f64084 100644
--- a/sys/netinet6/udp6_usrreq.c
+++ b/sys/netinet6/udp6_usrreq.c
@@ -722,7 +722,7 @@ udp6_output(struct socket *so, int flags_arg, struct mbuf *m,
 	sin6 = (struct sockaddr_in6 *)addr6;
 
 	/*
-	 * In contrast to to IPv4 we do not validate the max. packet length
+	 * In contrast to IPv4 we do not validate the max. packet length
 	 * here due to IPv6 Jumbograms (RFC2675).
 	 */