diff --git a/packages/runtime-core/src/apiCreateApp.ts b/packages/runtime-core/src/apiCreateApp.ts
index 4e3079e436f..62806b198dd 100644
--- a/packages/runtime-core/src/apiCreateApp.ts
+++ b/packages/runtime-core/src/apiCreateApp.ts
@@ -236,6 +236,7 @@ export function createAppAPI<HostElement>(
         } else if (__DEV__) {
           warn(`Cannot unmount an app that is not mounted.`)
         }
+        isMounted = false
       },
 
       provide(key, value) {