diff --git a/.gitignore b/.gitignore
index 3a9875b..2659611 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1 @@
-/vendor/
 composer.lock
diff --git a/wp-autoless.php b/wp-autoless.php
index a2b09d8..6ca2b2a 100644
--- a/wp-autoless.php
+++ b/wp-autoless.php
@@ -37,7 +37,7 @@ function compile () {
 
 	foreach ( $lessfiles as $lessfile ) {
 		$lessmtime = filemtime( $lessfile );
-		$cssfile = str_replace( '.less', '.css', $lessfile );
+		$cssfile = preg_replace( '/\.less$/i', '.css', $lessfile );
 		$cssmtime = file_exists ( $cssfile ) ? filemtime( $cssfile ) : '0';
 
 		if ( $cssmtime < $lessmtime ) {