diff --git a/rtemsbsd/include/machine/rtems-bsd-user-space.h b/rtemsbsd/include/machine/rtems-bsd-user-space.h
index 47f9e00b..0b6a3a99 100644
--- a/rtemsbsd/include/machine/rtems-bsd-user-space.h
+++ b/rtemsbsd/include/machine/rtems-bsd-user-space.h
@@ -49,6 +49,8 @@
 
 #define O_CLOEXEC 0
 
+#define O_DIRECTORY 0
+
 /* FIXME: Add lock capabilities to RTEMS file system */
 #define O_EXLOCK 0
 #define O_SHLOCK 0