diff --git a/configure.ac b/configure.ac
index c1bfd65..d37fb2d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,7 @@
 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.
 
+AC_PREREQ([2.62])
 AC_INIT
 X_AC_META
 AC_CONFIG_AUX_DIR([config])