diff --git a/types/alexa-sdk/index.d.ts b/types/alexa-sdk/index.d.ts
index 7c0bf42f8e..1c39755b2d 100644
--- a/types/alexa-sdk/index.d.ts
+++ b/types/alexa-sdk/index.d.ts
@@ -122,7 +122,7 @@ export interface Resolutions {
 }
 
 export interface SlotValue {
-    confirmationStatus: ConfirmationStatuses;
+    confirmationStatus?: ConfirmationStatuses;
     name: string;
     value?: any;
     resolutions?: Resolutions;