diff --git a/src/FilterLists.Web/ClientApp/Boot.tsx b/src/FilterLists.Web/ClientApp/Boot.tsx
index 26300832f..b6f2077ca 100644
--- a/src/FilterLists.Web/ClientApp/Boot.tsx
+++ b/src/FilterLists.Web/ClientApp/Boot.tsx
@@ -6,7 +6,7 @@ import * as RoutesModule from "./Routes";
 let routes = RoutesModule.Routes;
 
 const renderApp = () => {
-    const baseUrl = document.getElementsByTagName("base")[0].getAttribute("href");
+    const baseUrl = document.getElementsByTagName("base")[0].getAttribute("href")!;
     ReactDOM.render(
         <AppContainer>
             <BrowserRouter children={ routes } basename={ baseUrl }/>