diff --git a/configure.ac b/configure.ac
index e64280f..eb7f89a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
-AC_PREREQ([2.65])
+AC_PREREQ([2.61])
 AC_INIT([mosh], [0.96a], [mosh-devel@mit.edu])
 AM_INIT_AUTOMAKE([-Wall -Werror foreign])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])