diff --git a/configure.in b/configure.in
index d98e385dd..db573e89e 100644
--- a/configure.in
+++ b/configure.in
@@ -12,7 +12,7 @@ dnl Initialisation
 dnl ---------------
 
 dnl Initialisation of configure
-AC_INIT(ngspice,20+,ngspice-bugs@lists.sourceforge.net)
+AC_INIT(ngspice,20plus,ngspice-bugs@lists.sourceforge.net)
 
 dnl Unique file in the source directory
 AC_CONFIG_SRCDIR([src/ngspice.c])