diff --git a/autogen.sh b/autogen.sh
index c9396c5f3..714bc1645 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -7,7 +7,7 @@ test -z "$srcdir" && srcdir=.
 PKG_NAME="mutter"
 REQUIRED_AUTOMAKE_VERSION=1.10
 
-(test -f $srcdir/configure.in \
+(test -f $srcdir/configure.ac \
   && test -d $srcdir/src) || {
     echo -n "**Error**: Directory "\`$srcdir\'" does not look like the"
     echo " top-level metacity directory"
diff --git a/configure.in b/configure.ac
similarity index 100%
rename from configure.in
rename to configure.ac