diff --git a/src/room/InCallView.tsx b/src/room/InCallView.tsx
index 69ae06db..5cb89061 100644
--- a/src/room/InCallView.tsx
+++ b/src/room/InCallView.tsx
@@ -358,7 +358,7 @@ export const InCallView: FC<InCallViewProps> = ({
 
   // We need to set the proper timings on the animation based upon the sound length.
   const ringDuration = pickupPhaseAudio?.soundDuration["waiting"] ?? 1;
-  useEffect(() => {
+  useEffect((): (() => void) => {
     // The CSS animation includes the delay, so we must double the length of the sound.
     window.document.body.style.setProperty(
       "--call-ring-duration-s",