diff --git a/rsh.c b/rsh.c
index 4d6a90bf6..af2f47b17 100644
--- a/rsh.c
+++ b/rsh.c
@@ -1,6 +1,7 @@
 #include "rsh.h"
 
 #include <string.h>
+#include <sys/types.h>
 #include <sys/socket.h>
 
 #include "cache.h"