diff --git a/sgsnemu/syserr.c b/sgsnemu/syserr.c
index 9d793e0..7223414 100644
--- a/sgsnemu/syserr.c
+++ b/sgsnemu/syserr.c
@@ -15,6 +15,7 @@
  */
 
 #include <stdarg.h>
+#include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <stdio.h>