diff --git a/types/muibox/index.d.ts b/types/muibox/index.d.ts
index fc73983d6b..b7c96bc408 100644
--- a/types/muibox/index.d.ts
+++ b/types/muibox/index.d.ts
@@ -36,4 +36,5 @@ export interface ConfirmOptions extends AlertOptions {
 export interface PromptOptions extends ConfirmOptions {
     required?: boolean;
     defaultValue?: string | number;
+    placeholder?: string;
 }
diff --git a/types/muibox/muibox-tests.ts b/types/muibox/muibox-tests.ts
index 70254edb5a..b5bc22e579 100644
--- a/types/muibox/muibox-tests.ts
+++ b/types/muibox/muibox-tests.ts
@@ -31,6 +31,7 @@ dialog
     .prompt({
         message: "What is your name?",
         title: "Salutation",
+        placeholder: "Name",
         ok: { text: "Proceed" },
         cancel: { text: "Quit" },
         defaultValue: "Joe",