diff --git a/modules/src/system/open.c b/modules/src/system/open.c
index 3ec515a77..cb6e7537e 100644
--- a/modules/src/system/open.c
+++ b/modules/src/system/open.c
@@ -9,6 +9,10 @@
 #include <errno.h>
 #include "system.h"
 
+#if !defined WIN32
+#define O_BINARY 0
+#endif
+
 extern File *_get_entry();
 
 int