diff --git a/src/utils/color.ts b/src/utils/color.ts
index 67a6b5624..3c0ca5e63 100644
--- a/src/utils/color.ts
+++ b/src/utils/color.ts
@@ -6,7 +6,7 @@
  * @return  Boolean
  */
 export function isHexColor(color: string) {
-  const reg = /^#([0-9a-fA-F]{3}|[0-9a-fA-f]{6})$/;
+  const reg = /^#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$/;
   return reg.test(color);
 }