diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index 0692fbac..df363b07 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -19,6 +19,7 @@
 #include <sys/ioctl.h>
 #include <sys/socket.h>
 #include <sys/ioctl.h>
+#include <sys/param.h>
 #include <errno.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>