diff --git a/config.h.in b/config.h.in
index ad008059fc..75fbd002e7 100644
--- a/config.h.in
+++ b/config.h.in
@@ -1,4 +1,4 @@
-/* config.h.in.  Generated from configure.in by autoheader.  */
+/* config.h.in.  Generated from configure.ac by autoheader.  */
 
 /* Define if building universal (internal helper macro) */
 #undef AC_APPLE_UNIVERSAL_BUILD
diff --git a/configure.in b/configure.ac
similarity index 100%
rename from configure.in
rename to configure.ac