diff --git a/configure.ac b/configure.ac
index 1bf94025..f769f8f6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-## Copyright (C) 2008-2016 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
+## Copyright (C) 2008-2017 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
 ##
 ## This program is free software; you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -50,7 +50,7 @@ AC_PROG_CC_C99
 AC_PROG_INSTALL
 AC_HEADER_STDC
 
-AX_COMPILER_FLAGS
+AX_COMPILER_FLAGS(,,[yes])
 
 # for now, use AM_PROG_LIBTOOL, as we don't want to require
 # a too new setup for autotools/libtool