diff --git a/expat/MANIFEST b/expat/MANIFEST
index 7a020dc0..20915270 100644
--- a/expat/MANIFEST
+++ b/expat/MANIFEST
@@ -54,7 +54,7 @@ MANIFEST
 Makefile.in
 README
 configure
-configure.in
+configure.ac
 expat_config.h.in
 expat_config.h.cmake
 expat.pc.in
diff --git a/expat/configure.in b/expat/configure.ac
similarity index 100%
rename from expat/configure.in
rename to expat/configure.ac