diff --git a/Gruntfile.js b/Gruntfile.js
index 0ae3a7c4..f118d0e9 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -19,7 +19,7 @@ module.exports = function ( grunt ) {
 		banana: conf.MessagesDirs,
 		stylelint: {
 			all: [
-				'**/*.css',
+				'**/*.{css,less}',
 				'!node_modules/**',
 				'!vendor/**'
 			]