diff --git a/src/hooks/useHeadingTitleSync.ts b/src/hooks/useHeadingTitleSync.ts
index 7e27fa15..0f20b546 100644
--- a/src/hooks/useHeadingTitleSync.ts
+++ b/src/hooks/useHeadingTitleSync.ts
@@ -23,7 +23,7 @@ export function useHeadingTitleSync({
   onTitleSync,
 }: HeadingTitleSyncConfig) {
   const syncActiveRef = useRef(true)
-  const debounceTimerRef = useRef<ReturnType<typeof setTimeout> | undefined>(undefined)
+  const debounceTimerRef = useRef<number | undefined>(undefined)
   const activeTabPathRef = useRef(activeTabPath)
   // eslint-disable-next-line react-hooks/refs
   activeTabPathRef.current = activeTabPath