diff --git a/license.txt b/license.txt
index 4581602a29778839443b298a7e946f50b855975a..0d947f8ae2da851d6ebb9d3c329dca75cf2856c6 100644
--- a/license.txt
+++ b/license.txt
@@ -177,19 +177,11 @@ License: GPL-3+ with Autoconf exception
 Files: m4/ax_boost_base.m4
 Copyright: 2008 Thomas Porschberg <thomas@randspringer.de>
            2009 Peter Adolphs
-License: other
- Copying and distribution of this file, with or without modification, are
- permitted in any medium without royalty provided the copyright notice
- and this notice are preserved. This file is offered as-is, without any
- warranty.
+License: permissive-autoconf
 
 Files: m4/ax_compare_version.m4
 Copyright: 2008 Tim Toolan <toolan@ele.uri.edu>
-License: other
- Copying and distribution of this file, with or without modification, are
- permitted in any medium without royalty provided the copyright notice
- and this notice are preserved. This file is offered as-is, without any
- warranty.
+License: permissive-autoconf
 
 Files: m4/ax_latex_bibtex_test.m4 m4/ax_latex_class.m4 m4/ax_tex_test.m4
 Copyright: 2008 Boretti Mathieu <boretti@eig.unige.ch>
@@ -859,3 +851,9 @@ License: CC-BY-SA-4.0
  licenses.
  .
  Creative Commons may be contacted at creativecommons.org.
+
+License: permissive-autoconf
+ Copying and distribution of this file, with or without modification, are
+ permitted in any medium without royalty provided the copyright notice
+ and this notice are preserved. This file is offered as-is, without any
+ warranty.