diff --git a/typescript/react-navigation.d.ts b/typescript/react-navigation.d.ts
index 0488c06dfa..8a726a6565 100644
--- a/typescript/react-navigation.d.ts
+++ b/typescript/react-navigation.d.ts
@@ -124,7 +124,7 @@ declare module 'react-navigation' {
     routes: NavigationRoute[];
     isTransitioning: boolean;
     key: string;
-    params: NavigationParams;
+    params: NavigationParams | undefined;
   }
 
   export interface DrawerNavigationState extends NavigationState {