diff --git a/bits/mman.h b/bits/mman.h
index a2ee064cae..0c15902706 100644
--- a/bits/mman.h
+++ b/bits/mman.h
@@ -1,5 +1,5 @@
 /* Definitions for BSD-style memory management.
-   Copyright (C) 1994-1998,2000,01,02 Free Software Foundation, Inc.
+   Copyright (C) 1994-1998,2000,01,02,05 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -85,6 +85,12 @@
 #define MS_SYNC		0		/* Synchronous memory sync.  */
 #define MS_INVALIDATE	2		/* Invalidate the caches.  */
 
+/* Flags for `mremap'.  */
+#ifdef __USE_GNU
+# define MREMAP_MAYMOVE	1		/* Mapping address may change.  */
+# define MREMAP_FIXED	2		/* Fifth argument sets new address.  */
+#endif
+
 /* Flags for `mlockall' (can be OR'd together).  */
 #define MCL_CURRENT	1		/* Lock all currently mapped pages.  */
 #define MCL_FUTURE	2		/* Lock all additions to address
diff --git a/sysdeps/generic/bits/mman.h b/sysdeps/generic/bits/mman.h
index a2ee064cae..0c15902706 100644
--- a/sysdeps/generic/bits/mman.h
+++ b/sysdeps/generic/bits/mman.h
@@ -1,5 +1,5 @@
 /* Definitions for BSD-style memory management.
-   Copyright (C) 1994-1998,2000,01,02 Free Software Foundation, Inc.
+   Copyright (C) 1994-1998,2000,01,02,05 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -85,6 +85,12 @@
 #define MS_SYNC		0		/* Synchronous memory sync.  */
 #define MS_INVALIDATE	2		/* Invalidate the caches.  */
 
+/* Flags for `mremap'.  */
+#ifdef __USE_GNU
+# define MREMAP_MAYMOVE	1		/* Mapping address may change.  */
+# define MREMAP_FIXED	2		/* Fifth argument sets new address.  */
+#endif
+
 /* Flags for `mlockall' (can be OR'd together).  */
 #define MCL_CURRENT	1		/* Lock all currently mapped pages.  */
 #define MCL_FUTURE	2		/* Lock all additions to address