diff --git a/configure.in b/configure.in
index 60e34eeb9f5..f527661169e 100644
--- a/configure.in
+++ b/configure.in
@@ -7,7 +7,7 @@ AC_INIT(sql/mysqld.cc)
 AC_CANONICAL_SYSTEM
 # The Docs Makefile.am parses this line!
 # remember to also change ndb version below and update version.c in ndb
-AM_INIT_AUTOMAKE(mysql, 5.0.20)
+AM_INIT_AUTOMAKE(mysql, 5.0.20a)
 AM_CONFIG_HEADER(config.h)
 
 PROTOCOL_VERSION=10