diff --git a/acinclude.m4 b/acinclude.m4
index dbc40beae..e83253bde 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -6,5 +6,4 @@ dnl Only include this if we're using an old Autoconf.  Remove when we
 dnl finally drop support for AC 2.59
 m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]), [2.60]), -1,
       [m4_include([config/ac_prog_cc_c99.m4])
-	   m4_include([config/ac_prog_sed.m4])
        m4_include([config/ac_use_system_extensions.m4])])