diff --git a/vendor-overwrites/csslint/parserlib.js b/vendor-overwrites/csslint/parserlib.js
index 03762f92..6e3a24e5 100644
--- a/vendor-overwrites/csslint/parserlib.js
+++ b/vendor-overwrites/csslint/parserlib.js
@@ -757,7 +757,7 @@ self.parserlib = (() => {
 
       '<gradient>': part =>
         part.type === 'function' &&
-        /^(?:-(?:ms|moz|o|webkit)-)?(?:repeating-)?(?:radial-|linear-)?gradient/i.test(part),
+        /^(?:-(?:ms|moz|o|webkit)-)?(?:repeating-)?(?:radial-|linear-|conic-)?gradient/i.test(part),
 
       //eslint-disable-next-line no-use-before-define
       '<hex-color>': part => part.tokenType === Tokens.HASH,