diff --git a/newlib/libc/sys/rtems/include/sys/mman.h b/newlib/libc/sys/rtems/include/sys/mman.h
index 867b68647..89cc4d699 100644
--- a/newlib/libc/sys/rtems/include/sys/mman.h
+++ b/newlib/libc/sys/rtems/include/sys/mman.h
@@ -133,6 +133,14 @@
  */
 #define MAP_FAILED	((void *)-1)
 
+/*
+ * Flags provided to shm_rename
+ */
+/* Don't overwrite dest, if it exists */
+#define SHM_RENAME_NOREPLACE	(1 << 0)
+/* Atomically swap src and dest */
+#define SHM_RENAME_EXCHANGE	(1 << 1)
+
 /*
  * msync() flags
  */
@@ -264,6 +272,7 @@ int	posix_madvise(void *, size_t, int);
 int	mlockall(int);
 int	munlockall(void);
 int	shm_open(const char *, int, mode_t);
+int	shm_rename(const char *, const char *, int);
 int	shm_unlink(const char *);
 #endif
 #if __BSD_VISIBLE