diff --git a/src/mixin.ts b/src/mixin.ts
index 54f0c21e..fb714135 100644
--- a/src/mixin.ts
+++ b/src/mixin.ts
@@ -115,7 +115,7 @@ export function mixin(Vue: VueConstructor) {
         return activateCurrentInstance(instance, () => bindingFunc())
       }
       return
-    } else if (isPlainObject(binding)) {
+    } else if (isObject(binding)) {
       if (isReactive(binding)) {
         binding = toRefs(binding) as Data
       }