diff --git a/src/apis/computed.ts b/src/apis/computed.ts
index 2cac40a8..50f4cd8f 100644
--- a/src/apis/computed.ts
+++ b/src/apis/computed.ts
@@ -97,11 +97,8 @@ export function computed<T>(
     }
   }
 
-  return createRef<T>(
-    {
-      get: computedGetter,
-      set: computedSetter,
-    },
-    !setter
-  )
+  return createRef<T>({
+    get: computedGetter,
+    set: computedSetter,
+  })
 }
diff --git a/src/reactivity/ref.ts b/src/reactivity/ref.ts
index b251f693..fb1b8340 100644
--- a/src/reactivity/ref.ts
+++ b/src/reactivity/ref.ts
@@ -58,7 +58,7 @@ export class RefImpl<T> implements Ref<T> {
   }
 }
 
-export function createRef<T>(options: RefOption<T>, readonly = false) {
+export function createRef<T>(options: RefOption<T>) {
   const r = new RefImpl<T>(options)
   // seal the ref, this could prevent ref from being observed
   // It's safe to seal the ref, since we really shouldn't extend it.