diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index df415cfa7..0390de431 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,7 @@
+2009-05-09  Christopher Faylor  <me+cygwin@cgf.cx>
+
+	* cygwin/version.h (CYGWIN_VERSION_CYGWIN_CONV): New define.
+
 2009-05-09  Corinna Vinschen  <corinna@vinschen.de>
 
 	* dtable.cc (dtable::init_std_file_from_handle): Add workaround for
diff --git a/winsup/cygwin/include/cygwin/version.h b/winsup/cygwin/include/cygwin/version.h
index 251010c97..82a618197 100644
--- a/winsup/cygwin/include/cygwin/version.h
+++ b/winsup/cygwin/include/cygwin/version.h
@@ -98,6 +98,8 @@ details. */
 #define CYGWIN_VERSION_CHECK_FOR_OLD_CTYPE \
   (CYGWIN_VERSION_USER_API_VERSION_COMBINED <= 209)
 
+#define CYGWIN_VERSION_CYGWIN_CONV 181
+
      /* API_MAJOR 0.0: Initial version.  API_MINOR changes:
 	1: Export cygwin32_ calls as cygwin_ as well.
 	2: Export j1, jn, y1, yn.