diff --git a/configure.ac b/configure.ac
index 9a06e45..b2e34e1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@ AC_PREREQ(2.57)
 
 dnl This is the one location where the authoritative version number is stored
 AC_INIT(shellinabox, 2.4, markus@shellinabox.com)
-VCS_REVISION=`echo '$Revision: 66$'|sed 's/.Revision: \(.*\)./\1/'`
+VCS_REVISION=`echo '$Rev$'|sed 's/.Revision: \(.*\)./\1/'`
 AC_SUBST(VCS_REVISION)
 AC_DEFINE_UNQUOTED(VCS_REVISION, "${VCS_REVISION}",
                    [Most recent revision number in the version control system])