diff --git a/configure.ac b/configure.ac
index 67c0ae7dfbaea67d9148b4f4f3be9e1a6410b185..84cd9b7e668f365732ad1e9f94e3d949e59efe52 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,7 +3,7 @@
 #------------------------------------------------------------------------------
 
 AC_PREREQ(2.59)
-AC_INIT([ethercat],[1.3.1-pre],[fp@igh-essen.com])
+AC_INIT([ethercat],[1.3.1],[fp@igh-essen.com])
 AC_CONFIG_AUX_DIR([autoconf])
 AM_INIT_AUTOMAKE([-Wall -Werror dist-bzip2])
 AC_PREFIX_DEFAULT([/opt/etherlab])