diff --git a/src/lab/QuestCubeLab.tsx b/src/lab/QuestCubeLab.tsx
index 759f2f2..ca42d09 100644
--- a/src/lab/QuestCubeLab.tsx
+++ b/src/lab/QuestCubeLab.tsx
@@ -246,7 +246,7 @@ const QuestCubeLab = () => {
   const [xrSupported] = useState(() =>
     typeof navigator !== "undefined" &&
     "xr" in navigator &&
-    typeof (navigator as Navigator & { xr?: { isSessionSupported?: Function } }).xr?.isSessionSupported === "function"
+    typeof (navigator as Navigator & { xr?: { isSessionSupported?: (mode: string) => Promise<boolean> } }).xr?.isSessionSupported === "function"
   );
 
   const posRef = useRef(cubePos);