diff --git a/configure.in b/configure.in
index c43d39ca..c9969764 100644
--- a/configure.in
+++ b/configure.in
@@ -1,6 +1,6 @@
-dnl Process this file with autoconf 2.59 or later to produce
+dnl Process this file with autoconf 2.61 or later to produce
 dnl a configure script.
-AC_PREREQ(2.59)
+AC_PREREQ(2.61)
 AC_INIT(config.h.in)
 AC_CONFIG_HEADERS(config.h)