diff --git a/src/ol/color.js b/src/ol/color.js
index a4c4ef64fd..a6112d11b7 100644
--- a/src/ol/color.js
+++ b/src/ol/color.js
@@ -11,7 +11,7 @@ import {clamp} from './math.js';
  * @type {RegExp}
  * @private
  */
-const HEX_COLOR_RE_ = /^#(?:[0-9a-f]{3,4}){1,2}$/i;
+const HEX_COLOR_RE_ = /^#([a-f0-9]{3}|[a-f0-9]{4}(?:[a-f0-9]{2}){0,2})$/i;
 
 
 /**