diff --git a/packages/runtime-core/src/apiCreateApp.ts b/packages/runtime-core/src/apiCreateApp.ts
index bcb2fec1c32..2896937045e 100644
--- a/packages/runtime-core/src/apiCreateApp.ts
+++ b/packages/runtime-core/src/apiCreateApp.ts
@@ -272,6 +272,7 @@ export function createAppAPI<HostElement>(
           if (__DEV__ || __FEATURE_PROD_DEVTOOLS__) {
             devtoolsUnmountApp(app)
           }
+          delete app._container.__vue_app__
         } else if (__DEV__) {
           warn(`Cannot unmount an app that is not mounted.`)
         }