diff --git a/lib-src/lib-widget-extra/configure.in b/lib-src/lib-widget-extra/configure.ac
similarity index 98%
rename from lib-src/lib-widget-extra/configure.in
rename to lib-src/lib-widget-extra/configure.ac
index dbb703329..e382870b7 100644
--- a/lib-src/lib-widget-extra/configure.in
+++ b/lib-src/lib-widget-extra/configure.ac
@@ -1,5 +1,5 @@
 dnl
-dnl libwidgetextra configure.in script
+dnl libwidgetextra configure.ac script
 dnl
 dnl Joshua Haberman
 dnl Dominic Mazzoni
@@ -7,7 +7,7 @@ dnl Richard Ash
 dnl
 
 dnl
-dnl Instructions: to create "configure" from "configure.in", run:
+dnl Instructions: to create "configure" from "configure.ac", run:
 dnl
 
 dnl Process this file with autoconf to produce a configure script.