diff --git a/desktop/flipper-server/src/startBaseServer.tsx b/desktop/flipper-server/src/startBaseServer.tsx
index e91d51eaf..33184328f 100644
--- a/desktop/flipper-server/src/startBaseServer.tsx
+++ b/desktop/flipper-server/src/startBaseServer.tsx
@@ -219,7 +219,7 @@ function addWebsocket(server: http.Server, config: Config) {
   });
 
   server.on('upgrade', function upgrade(request, socket, head) {
-    const {pathname} = parse(request.url);
+    const {pathname} = parse(request.url!);
 
     // Handled by Metro
     if (pathname === '/hot') {
diff --git a/desktop/flipper-ui-browser/src/flipperServerConnection.tsx b/desktop/flipper-ui-browser/src/flipperServerConnection.tsx
index 00a9eacf4..46f1e54bc 100644
--- a/desktop/flipper-ui-browser/src/flipperServerConnection.tsx
+++ b/desktop/flipper-ui-browser/src/flipperServerConnection.tsx
@@ -22,7 +22,7 @@ export function createFlipperServer(): Promise<FlipperServer> {
   // TODO: polish this all!
   window.flipperShowError?.('Connecting to server...');
   return new Promise<FlipperServer>((resolve, reject) => {
-    let initialConnectionTimeout: number | undefined = setTimeout(() => {
+    let initialConnectionTimeout: number | undefined = window.setTimeout(() => {
       reject(
         new Error('Failed to connect to Flipper server in a timely manner'),
       );