diff --git a/src/first_network_device.c b/src/first_network_device.c
index 16f23e0..06d8b4a 100644
--- a/src/first_network_device.c
+++ b/src/first_network_device.c
@@ -1,4 +1,5 @@
 // vim:ts=4:sw=4:expandtab
+#include <sys/socket.h>
 #include <sys/stat.h>
 #include <stdlib.h>
 #include <ifaddrs.h>