1 files changed, 5 insertions, 0 deletions

diff --git a/rbutil/mktccboot/mktccboot.h b/rbutil/mktccboot/mktccboot.h
index 2df2c54506..17179c11e7 100644
--- a/rbutil/mktccboot/mktccboot.h
+++ b/rbutil/mktccboot/mktccboot.h
@@ -25,6 +25,11 @@
 #ifndef _MKTCCBOOT_H_
 #define _MKTCCBOOT_H_
 
+/* win32 compatibility */
+#ifndef O_BINARY
+#define O_BINARY 0
+
+#endif
 #ifdef __cplusplus
 extern "C" {
 #endif