diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index f43c2bcc9eb..1102bf9931b 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -31,7 +31,7 @@ dnl===
 dnl===-----------------------------------------------------------------------===
 dnl Initialize autoconf and define the package name, version number and
 dnl email address for reporting bugs.
-AC_INIT([[llvm]],[[1.5]],[llvmbugs@cs.uiuc.edu])
+AC_INIT([[llvm]],[[1.5cvs]],[llvmbugs@cs.uiuc.edu])
 
 dnl Provide a copyright substitution and ensure the copyright notice is included
 dnl in the output of --version option of the generated configure script.