diff --git a/packages/react-navigation/flow/react-navigation.js b/packages/react-navigation/flow/react-navigation.js
index 213de866..d9896b75 100644
--- a/packages/react-navigation/flow/react-navigation.js
+++ b/packages/react-navigation/flow/react-navigation.js
@@ -332,12 +332,12 @@ declare module 'react-navigation' {
     navigationOptions?: ?NavigationScreenConfig<Options>,
   };
 
-  declare export type NavigationRouteConfig = 
-  | NavigationComponent
-  | {
-    navigationOptions?: NavigationScreenConfig<*>,
-    path?: string,
-  } & NavigationScreenRouteConfig;
+  declare export type NavigationRouteConfig =
+    | NavigationComponent
+    | ({
+        navigationOptions?: NavigationScreenConfig<*>,
+        path?: string,
+      } & NavigationScreenRouteConfig);
 
   declare export type NavigationScreenRouteConfig =
     | NavigationComponent
diff --git a/packages/react-navigation/package.json b/packages/react-navigation/package.json
index 74a66b0b..fc25ceb9 100644
--- a/packages/react-navigation/package.json
+++ b/packages/react-navigation/package.json
@@ -72,6 +72,10 @@
     "modulePathIgnorePatterns": ["examples"]
   },
   "lint-staged": {
-    "*.js": ["eslint --fix", "git add"]
+    "*.js": [
+      "eslint --fix",
+      "prettier --write flow/react-navigation.js",
+      "git add"
+    ]
   }
 }