diff --git a/gatchat/ppp_net.c b/gatchat/ppp_net.c
index a4dacaef..79d354db 100644
--- a/gatchat/ppp_net.c
+++ b/gatchat/ppp_net.c
@@ -30,6 +30,7 @@
 #include <net/if.h>
 #include <linux/if_tun.h>
 #include <sys/ioctl.h>
+#include <arpa/inet.h>
 
 #include <glib.h>