diff --git a/lib/ipv6.h b/lib/ipv6.h
index 2efd9e69..191c1c74 100644
--- a/lib/ipv6.h
+++ b/lib/ipv6.h
@@ -9,6 +9,7 @@
 #ifndef _BIRD_IPV6_H_
 #define _BIRD_IPV6_H_
 
+#include <sys/types.h>
 #include <netinet/in.h>
 #include "lib/string.h"