diff --git a/libc/include/net/if_arp.h b/libc/include/net/if_arp.h
index a25f1b4..5eae82c 100644
--- a/libc/include/net/if_arp.h
+++ b/libc/include/net/if_arp.h
@@ -1 +1,2 @@
+#include <sys/socket.h>
 #include <linux/if_arp.h>