diff --git a/Gruntfile.js b/Gruntfile.js
index 600a23d31a..42dab3be14 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -193,7 +193,7 @@ module.exports = function (grunt) {
 						bracketize: true,
 						quote_style: 1
 					},
-					preserveComments: 'all'
+					preserveComments: /^!/
 				}
 			},
 			minify: {