diff --git a/winsup/w32api/ChangeLog b/winsup/w32api/ChangeLog
index 7ec00f860..c28be381c 100644
--- a/winsup/w32api/ChangeLog
+++ b/winsup/w32api/ChangeLog
@@ -1,3 +1,8 @@
+2007-07-17  Corinna Vinschen  <corinna@vinschen.de>
+
+	* include/winnt.h (FILE_READ_ONLY_VOLUME): Define.
+	* include/ddk/ntifs.h (FILE_READ_ONLY_VOLUME): Define.
+
 2007-07-12  Chris Sutcliffe  <ir0nh34d@users.sourceforge.net>
 
 	* include/winuser.h (FE_FONTSMOOTHINGSTANDARD, FE_FONTSMOOTHINGCLEARTYPE):
diff --git a/winsup/w32api/include/ddk/ntifs.h b/winsup/w32api/include/ddk/ntifs.h
index c78b7a807..2524e278c 100644
--- a/winsup/w32api/include/ddk/ntifs.h
+++ b/winsup/w32api/include/ddk/ntifs.h
@@ -135,6 +135,7 @@ extern PACL                         SeSystemDefaultDacl;
 #define FILE_SUPPORTS_OBJECT_IDS        0x00010000
 #define FILE_SUPPORTS_ENCRYPTION        0x00020000
 #define FILE_NAMED_STREAMS              0x00040000
+#define FILE_READ_ONLY_VOLUME           0x00080000
 
 #define FILE_PIPE_BYTE_STREAM_TYPE      0x00000000
 #define FILE_PIPE_MESSAGE_TYPE          0x00000001
diff --git a/winsup/w32api/include/winnt.h b/winsup/w32api/include/winnt.h
index 2db64bd93..b2465b595 100644
--- a/winsup/w32api/include/winnt.h
+++ b/winsup/w32api/include/winnt.h
@@ -377,6 +377,7 @@ typedef DWORD FLONG;
 #define FILE_SUPPORTS_OBJECT_IDS        0x00010000
 #define FILE_SUPPORTS_ENCRYPTION        0x00020000
 #define FILE_NAMED_STREAMS              0x00040000
+#define FILE_READ_ONLY_VOLUME           0x00080000
 
 #define IO_COMPLETION_QUERY_STATE       0x0001
 #define IO_COMPLETION_MODIFY_STATE      0x0002