diff --git a/app/src/protyle/toolbar/Font.ts b/app/src/protyle/toolbar/Font.ts
index 34c973a08..fbf6c6f67 100644
--- a/app/src/protyle/toolbar/Font.ts
+++ b/app/src/protyle/toolbar/Font.ts
@@ -355,7 +355,6 @@ export const setFontStyle = (textElement: HTMLElement, textOption: ITextOption)
                 break;
             case "inline-memo":
                 textElement.removeAttribute("contenteditable");
-                textElement.removeAttribute("data-subtype");
                 textElement.removeAttribute("data-content");
                 break;
         }