diff --git a/flow/declarations.js b/flow/declarations.js
index 0072907a1..942aa73bf 100644
--- a/flow/declarations.js
+++ b/flow/declarations.js
@@ -36,6 +36,7 @@ declare type RouterOptions = {
   fallback?: boolean;
   base?: string;
   linkActiveClass?: string;
+  linkExactActiveClass?: string;
   parseQuery?: (query: string) => Object;
   stringifyQuery?: (query: Object) => string;
   scrollBehavior?: (