diff --git a/configure.ac b/configure.ac
index eb64f4d..a81849f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
-AC_PREREQ([2.69])
+AC_PREREQ([2.50])
 
 m4_define([pipecolors_version_major],[1])
 m4_define([pipecolors_version_minor],[2])