diff --git a/src/ar65/library.c b/src/ar65/library.c
index c142df99a..991cfe110 100644
--- a/src/ar65/library.c
+++ b/src/ar65/library.c
@@ -36,6 +36,8 @@
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
+#include <sys/types.h>
+#include <unistd.h>
 
 /* common */
 #include "cmdline.h"