diff --git a/rtemsbsd/include/machine/rtems-bsd-user-space.h b/rtemsbsd/include/machine/rtems-bsd-user-space.h
index acad9ff3..536ef8e2 100644
--- a/rtemsbsd/include/machine/rtems-bsd-user-space.h
+++ b/rtemsbsd/include/machine/rtems-bsd-user-space.h
@@ -46,6 +46,8 @@
 
 #include <stdio.h>
 
+#define O_CLOEXEC 0
+
 /* FIXME: Add lock capabilities to RTEMS file system */
 #define O_EXLOCK 0
 #define O_SHLOCK 0