diff --git a/configure.ac b/configure.ac
index 2f780b7a..ddd322c1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -32,7 +32,7 @@ m4_include(compat.m4)
 AC_DEFINE([OPENVPN_VERSION_RESOURCE], [PRODUCT_VERSION_RESOURCE], [Version in windows resource format])
 
 AC_CONFIG_AUX_DIR([.])
-AM_CONFIG_HEADER([config.h])
+AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_SRCDIR([src/openvpn/syshead.h])
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE