diff --git a/react-router-redux/index.d.ts b/react-router-redux/index.d.ts
index 98a0b6d00e..0736359b21 100644
--- a/react-router-redux/index.d.ts
+++ b/react-router-redux/index.d.ts
@@ -51,7 +51,7 @@ export interface SyncHistoryWithStoreOptions {
 }
 
 export interface HistoryUnsubscribe {
-    unsubscribe(): void;
+    unsubscribe(): undefined;
 }
 
 export function routerReducer(state?: RouterState, action?: Action): RouterState;
diff --git a/react-router-redux/v3/index.d.ts b/react-router-redux/v3/index.d.ts
index 105d081f30..70c43a0171 100644
--- a/react-router-redux/v3/index.d.ts
+++ b/react-router-redux/v3/index.d.ts
@@ -19,11 +19,11 @@ export const goForward: GoBackAction;
 export const routeActions: RouteActions;
 
 export type LocationDescriptor = History.LocationDescriptor;
-export type PushAction = (nextLocation: LocationDescriptor) => void;
-export type ReplaceAction = (nextLocation: LocationDescriptor) => void;
-export type GoAction = (n: number) => void;
-export type GoForwardAction = () => void;
-export type GoBackAction = () => void;
+export type PushAction = (nextLocation: LocationDescriptor) => undefined;
+export type ReplaceAction = (nextLocation: LocationDescriptor) => undefined;
+export type GoAction = (n: number) => undefined;
+export type GoForwardAction = () => undefined;
+export type GoBackAction = () => undefined;
 
 export interface RouteActions {
     push: PushAction;
@@ -34,11 +34,9 @@ export interface RouteActions {
 }
 
 export interface HistoryMiddleware extends Redux.Middleware {
-    listenForReplays(store: Redux.Store<any>, selectLocationState?: Function): void;
-    unsubscribe(): void;
+    listenForReplays(store: Redux.Store<any>, selectLocationState?: Function): undefined;
+    unsubscribe(): undefined;
 }
 
 export function routeReducer(state?: any, options?: any): Redux.Reducer<any>;
 export function syncHistory(history: History.History): HistoryMiddleware;
-
-
diff --git a/react-router/lib/IndexRoute.d.ts b/react-router/lib/IndexRoute.d.ts
index b0574df26a..59390dffbf 100644
--- a/react-router/lib/IndexRoute.d.ts
+++ b/react-router/lib/IndexRoute.d.ts
@@ -9,14 +9,14 @@ import {
     RouterState
 } from "react-router";
 
-type ComponentCallback = (err: any, component: RouteComponent) => void;
-type ComponentsCallback = (err: any, components: RouteComponents) => void;
+type ComponentCallback = (err: any, component: RouteComponent) => undefined;
+type ComponentsCallback = (err: any, components: RouteComponents) => undefined;
 
 export interface IndexRouteProps {
     component?: RouteComponent;
     components?: RouteComponents;
-    getComponent?(nextState: RouterState, callback: ComponentCallback): void;
-    getComponents?(nextState: RouterState, callback: ComponentsCallback): void;
+    getComponent?(nextState: RouterState, callback: ComponentCallback): undefined;
+    getComponents?(nextState: RouterState, callback: ComponentsCallback): undefined;
     onEnter?: EnterHook;
     onChange?: ChangeHook;
     onLeave?: LeaveHook;
diff --git a/react-router/lib/Route.d.ts b/react-router/lib/Route.d.ts
index 15aafebc75..7ff834cbf8 100644
--- a/react-router/lib/Route.d.ts
+++ b/react-router/lib/Route.d.ts
@@ -20,12 +20,12 @@ declare const Route: Route;
 
 export default Route;
 
-type RouteCallback = (err: any, route: PlainRoute) => void;
-type RoutesCallback = (err: any, routesArray: PlainRoute[]) => void;
+type RouteCallback = (err: any, route: PlainRoute) => undefined;
+type RoutesCallback = (err: any, routesArray: PlainRoute[]) => undefined;
 
 export interface PlainRoute extends RouteProps {
     childRoutes?: PlainRoute[];
-    getChildRoutes?(partialNextState: LocationState, callback: RoutesCallback): void;
+    getChildRoutes?(partialNextState: LocationState, callback: RoutesCallback): undefined;
     indexRoute?: PlainRoute;
-    getIndexRoute?(partialNextState: LocationState, callback: RouteCallback): void;
+    getIndexRoute?(partialNextState: LocationState, callback: RouteCallback): undefined;
 }
diff --git a/react-router/lib/Router.d.ts b/react-router/lib/Router.d.ts
index 02550026b9..33979d9c87 100644
--- a/react-router/lib/Router.d.ts
+++ b/react-router/lib/Router.d.ts
@@ -36,8 +36,8 @@ export type ChangeHook = (prevState: RouterState, nextState: RouterState, replac
 export type RouteHook = (nextLocation?: Location) => any;
 
 export interface RedirectFunction {
-    (location: LocationDescriptor): void;
-    (state: LocationState, pathname: Pathname | Path, query?: Query): void;
+    (location: LocationDescriptor): undefined;
+    (state: LocationState, pathname: Pathname | Path, query?: Query): undefined;
 }
 
 export interface RouterState {
@@ -47,11 +47,11 @@ export interface RouterState {
     components: RouteComponent[];
 }
 
-type LocationFunction = (location: LocationDescriptor) => void;
-type GoFunction = (n: number) => void;
-type NavigateFunction = () => void;
+type LocationFunction = (location: LocationDescriptor) => undefined;
+type GoFunction = (n: number) => undefined;
+type NavigateFunction = () => undefined;
 type ActiveFunction = (location: LocationDescriptor, indexOnly?: boolean) => boolean;
-type LeaveHookFunction = (route: any, callback: RouteHook) => void;
+type LeaveHookFunction = (route: any, callback: RouteHook) => undefined;
 type CreatePartFunction<Part> = (path: Path, query?: any) => Part;
 
 export interface InjectedRouter {
diff --git a/react-router/lib/match.d.ts b/react-router/lib/match.d.ts
index e9fd936ad9..48cec07676 100644
--- a/react-router/lib/match.d.ts
+++ b/react-router/lib/match.d.ts
@@ -18,7 +18,6 @@ interface MatchHistoryArgs extends MatchArgs {
     history: History;
 }
 
-export type MatchCallback = (error: any, redirectLocation: Location, renderProps: any) => void;
-
-export default function match(args: MatchLocationArgs | MatchHistoryArgs, cb: MatchCallback): void;
+export type MatchCallback = (error: any, redirectLocation: Location, renderProps: any) => undefined;
 
+export default function match(args: MatchLocationArgs | MatchHistoryArgs, cb: MatchCallback): undefined;