diff --git a/src/media-utils.ts b/src/media-utils.ts
index 55650eba..e0841cc8 100644
--- a/src/media-utils.ts
+++ b/src/media-utils.ts
@@ -48,7 +48,7 @@ export async function findDeviceByName(
  * @return The available media devices
  */
 export async function getDevices(): Promise<MediaDeviceInfo[]> {
-  let stream;
+  let stream: MediaStream;
   try {
     stream = await navigator.mediaDevices.getUserMedia({
       audio: true,