diff --git a/ssh-keygen.c b/ssh-keygen.c
index aa2030e..afa718a 100644
--- a/ssh-keygen.c
+++ b/ssh-keygen.c
@@ -15,6 +15,7 @@
 #include "includes.h"
 
 #include <sys/types.h>
+#include <sys/socket.h>
 #include <sys/stat.h>
 
 #include <openssl/evp.h>