diff --git a/m4/Makefile.am b/m4/Makefile.am
index f287079..cbec9d0 100644
--- a/m4/Makefile.am
+++ b/m4/Makefile.am
@@ -29,10 +29,10 @@
 
 EXTRA_DIST = \
 	README			\
-	ax_append_flag.m4	\
+	ax_c___attribute__.m4	\
 	ax_cflags_warn_all.m4	\
 	ax_compiler_vendor.m4	\
-	ax_c___attribute__.m4	\
+	ax_prepend_flag.m4	\
 	ax_require_defined.m4	\
 	ax_with_curses.m4	\
 	gnulib-cache.m4