diff --git a/src/types.ts b/src/types.ts
index e363ce19..2ef6f9b4 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -290,7 +290,7 @@ export interface ToastContainerProps extends CommonOptions, Pick<HTMLAttributes<
 export interface ToastTransitionProps {
   isIn: boolean;
   done: () => void;
-  position: ToastPosition | string;
+  position: ToastPosition;
   preventExitTransition: boolean;
   nodeRef: React.RefObject<HTMLElement | null>;
   children?: React.ReactNode;