diff --git a/src/room/CallEventAudioRenderer.test.tsx b/src/room/CallEventAudioRenderer.test.tsx
index 4ba24a5e..40b79da4 100644
--- a/src/room/CallEventAudioRenderer.test.tsx
+++ b/src/room/CallEventAudioRenderer.test.tsx
@@ -55,6 +55,7 @@ beforeEach(() => {
   (useAudioContext as MockedFunction<typeof useAudioContext>).mockReturnValue({
     playSound,
     playSoundLooping: vitest.fn(),
+    soundDuration: {},
   });
 });
 
diff --git a/src/room/GroupCallView.test.tsx b/src/room/GroupCallView.test.tsx
index 9bc0343b..15ac010e 100644
--- a/src/room/GroupCallView.test.tsx
+++ b/src/room/GroupCallView.test.tsx
@@ -99,6 +99,7 @@ beforeEach(() => {
   (useAudioContext as MockedFunction<typeof useAudioContext>).mockReturnValue({
     playSound,
     playSoundLooping: vi.fn(),
+    soundDuration: {},
   });
   // A trivial implementation of Active call to ensure we are testing GroupCallView exclusively here.
   (ActiveCall as MockedFunction<typeof ActiveCall>).mockImplementation(
@@ -212,6 +213,7 @@ test("GroupCallView plays a leave sound synchronously in widget mode", async ()
   (useAudioContext as MockedFunction<typeof useAudioContext>).mockReturnValue({
     playSound,
     playSoundLooping: vitest.fn(),
+    soundDuration: {},
   });
 
   const { getByText, rtcSession } = createGroupCallView(
diff --git a/src/room/ReactionAudioRenderer.test.tsx b/src/room/ReactionAudioRenderer.test.tsx
index 1d963491..f301832e 100644
--- a/src/room/ReactionAudioRenderer.test.tsx
+++ b/src/room/ReactionAudioRenderer.test.tsx
@@ -70,6 +70,7 @@ beforeEach(() => {
   (useAudioContext as MockedFunction<typeof useAudioContext>).mockReturnValue({
     playSound,
     playSoundLooping: vitest.fn(),
+    soundDuration: {},
   });
 });
 
diff --git a/src/useAudioContext.tsx b/src/useAudioContext.tsx
index 3e1da48c..59334dda 100644
--- a/src/useAudioContext.tsx
+++ b/src/useAudioContext.tsx
@@ -75,7 +75,7 @@ function playSoundLooping(
   let lastSoundPromise: Promise<void>;
   let nextSoundPromise: Promise<void>;
   let ac: AbortController | undefined;
-  void (async () => {
+  void (async (): Promise<void> => {
     ac = new AbortController();
     // Play a sound immediately
     lastSoundPromise = Promise.resolve();