diff --git a/configure.ac b/configure.ac
index 0054627fe..f04abfbb5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,7 +3,7 @@ dnl Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson
 dnl Copyright (c) 2007-2015, The Tor Project, Inc.
 dnl See LICENSE for licensing information
 
-AC_INIT([tor],[0.2.6.4-rc])
+AC_INIT([tor],[0.2.6.4-rc-dev])
 AC_CONFIG_SRCDIR([src/or/main.c])
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE
diff --git a/contrib/win32build/tor-mingw.nsi.in b/contrib/win32build/tor-mingw.nsi.in
index 8a3649de7..4a0350fd0 100644
--- a/contrib/win32build/tor-mingw.nsi.in
+++ b/contrib/win32build/tor-mingw.nsi.in
@@ -8,7 +8,7 @@
 !include "LogicLib.nsh"
 !include "FileFunc.nsh"
 !insertmacro GetParameters
-!define VERSION "0.2.6.4-rc"
+!define VERSION "0.2.6.4-rc-dev"
 !define INSTALLER "tor-${VERSION}-win32.exe"
 !define WEBSITE "https://www.torproject.org/"
 !define LICENSE "LICENSE"
diff --git a/src/win32/orconfig.h b/src/win32/orconfig.h
index 07c9b53d5..4d7a878d3 100644
--- a/src/win32/orconfig.h
+++ b/src/win32/orconfig.h
@@ -232,7 +232,7 @@
 #define USING_TWOS_COMPLEMENT
 
 /* Version number of package */
-#define VERSION "0.2.6.4-rc"
+#define VERSION "0.2.6.4-rc-dev"