diff --git a/plugins/techdocs-react/src/hooks.ts b/plugins/techdocs-react/src/hooks.ts
index e8cc7bddc8..42d8f0fbc1 100644
--- a/plugins/techdocs-react/src/hooks.ts
+++ b/plugins/techdocs-react/src/hooks.ts
@@ -82,6 +82,8 @@ export const useShadowRootSelection = (waitMillis: number = 0) => {
     [shadowRoot, setSelection, waitMillis],
   );
 
+  useEffect(() => handleSelectionChange.cancel);
+
   useEffect(() => {
     window.document.addEventListener('selectionchange', handleSelectionChange);
     return () =>