diff --git a/net/ipv6/proc.c b/net/ipv6/proc.c
index 4493761..41e9980 100644
--- a/net/ipv6/proc.c
+++ b/net/ipv6/proc.c
@@ -27,6 +27,7 @@
 #include <net/ip.h>
 #include <net/sock.h>
 #include <net/tcp.h>
+#include <net/udp.h>
 #include <net/transp_v6.h>
 #include <net/ipv6.h>