diff --git a/src/devkit/DevPanel.tsx b/src/devkit/DevPanel.tsx
index 9303d96..ae33ea0 100644
--- a/src/devkit/DevPanel.tsx
+++ b/src/devkit/DevPanel.tsx
@@ -51,7 +51,10 @@ export function DevPanel({ simXR, onToggleSimXR }: DevPanelProps) {
   const rafRef = useRef<number | null>(null);
 
   useEffect(() => { installLogger(); }, []);
-  useEffect(() => subscribeMacro(() => tick((n) => n + 1)), []);
+  useEffect(() => {
+    const unsub = subscribeMacro(() => tick((n) => n + 1));
+    return () => { unsub; };
+  }, []);
 
   useEffect(() => {
     let last = 0;