diff --git a/src/components/details/details.tsx b/src/components/details/details.tsx
index 21a77340b..226c76722 100644
--- a/src/components/details/details.tsx
+++ b/src/components/details/details.tsx
@@ -70,7 +70,7 @@ export class Details {
   }
 
   componentDidUnload() {
-    focusVisible.observe(this.details);
+    focusVisible.unobserve(this.details);
   }
 
   /** Shows the alert. */