diff --git a/ares/FILES b/ares/FILES
index 112403306c7b4f26dda878bf7bd2096930475554..72413ea6a7d311f8ce7a4d25811ffc3db13c5550 100644
--- a/ares/FILES
+++ b/ares/FILES
@@ -12,7 +12,7 @@ Makefile.in
 install-sh
 mkinstalldirs
 configure
-configure.in
+configure.ac
 config.guess
 config.sub
 vc/adig/adig.dep