diff --git a/configure.ac b/configure.ac
index 3fadff19..a5202bd0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
-AC_PREREQ([2.66])
+AC_PREREQ([2.61])
 AC_INIT(libwebsockets, 0.3, andy@warmcat.com)
 AC_CONFIG_SRCDIR([test-server/test-server.c])
 AC_CONFIG_HEADERS([config.h])