diff --git a/packages/editor/src/core/extensions/custom-color.ts b/packages/editor/src/core/extensions/custom-color.ts
index dc966816c56..9353414b427 100644
--- a/packages/editor/src/core/extensions/custom-color.ts
+++ b/packages/editor/src/core/extensions/custom-color.ts
@@ -93,6 +93,19 @@ export const CustomColorExtension = Mark.create({
     };
   },
 
+  addStorage() {
+    return {
+      markdown: {
+        serialize: {
+          open: "",
+          close: "",
+          mixable: true,
+          expelEnclosingWhitespace: true,
+        },
+      },
+    };
+  },
+
   parseHTML() {
     return [
       {