diff --git a/newlib/libc/sys/rtems/include/sys/mman.h b/newlib/libc/sys/rtems/include/sys/mman.h
index 8897acb32..8aeed87bc 100644
--- a/newlib/libc/sys/rtems/include/sys/mman.h
+++ b/newlib/libc/sys/rtems/include/sys/mman.h
@@ -43,6 +43,7 @@
 #define INHERIT_SHARE	0
 #define INHERIT_COPY	1
 #define INHERIT_NONE	2
+#define INHERIT_ZERO	3
 #endif
 
 /*