--- a/include/libnfnetlink/libnfnetlink.h
+++ b/include/libnfnetlink/libnfnetlink.h
@@ -15,6 +15,7 @@
 #define aligned_u64 unsigned long long __attribute__((aligned(8)))
 #endif
 
+#include <sys/types.h>
 #include <sys/socket.h>	/* for sa_family_t */
 #include <linux/netlink.h>
 #include <libnfnetlink/linux_nfnetlink.h>
