diff --git a/packages/reactivity/__tests__/effectScope.spec.ts b/packages/reactivity/__tests__/effectScope.spec.ts
index 28579fef028..a670c1ebc07 100644
--- a/packages/reactivity/__tests__/effectScope.spec.ts
+++ b/packages/reactivity/__tests__/effectScope.spec.ts
@@ -26,6 +26,14 @@ describe('reactivity/effect/scope', () => {
     expect(new EffectScope().run(() => 1)).toBe(1)
   })
 
+  it('should work w/ active property', () => {
+    const scope = new EffectScope()
+    scope.run(() => 1)
+    expect(scope.active).toBe(true)
+    scope.stop()
+    expect(scope.active).toBe(false)
+  })
+
   it('should collect the effects', () => {
     const scope = new EffectScope()
     scope.run(() => {
diff --git a/packages/reactivity/src/effectScope.ts b/packages/reactivity/src/effectScope.ts
index 557a1379492..c644d03fae6 100644
--- a/packages/reactivity/src/effectScope.ts
+++ b/packages/reactivity/src/effectScope.ts
@@ -7,7 +7,7 @@ export class EffectScope {
   /**
    * @internal
    */
-  active = true
+  private _active = true
   /**
    * @internal
    */
@@ -44,8 +44,12 @@ export class EffectScope {
     }
   }
 
+  get active() {
+    return this._active
+  }
+
   run<T>(fn: () => T): T | undefined {
-    if (this.active) {
+    if (this._active) {
       const currentEffectScope = activeEffectScope
       try {
         activeEffectScope = this
@@ -75,7 +79,7 @@ export class EffectScope {
   }
 
   stop(fromParent?: boolean) {
-    if (this.active) {
+    if (this._active) {
       let i, l
       for (i = 0, l = this.effects.length; i < l; i++) {
         this.effects[i].stop()
@@ -98,7 +102,7 @@ export class EffectScope {
         }
       }
       this.parent = undefined
-      this.active = false
+      this._active = false
     }
   }
 }
diff --git a/test-dts/reactivity.test-d.ts b/test-dts/reactivity.test-d.ts
index 8722441ec14..337f05e147e 100644
--- a/test-dts/reactivity.test-d.ts
+++ b/test-dts/reactivity.test-d.ts
@@ -1,73 +1,73 @@
-import {
-  ref,
-  readonly,
-  shallowReadonly,
-  describe,
-  expectError,
-  expectType,
-  Ref,
-  reactive,
-  markRaw
-} from './index'
-
-describe('should support DeepReadonly', () => {
-  const r = readonly({ obj: { k: 'v' } })
-  // @ts-expect-error
-  expectError((r.obj = {}))
-  // @ts-expect-error
-  expectError((r.obj.k = 'x'))
-})
-
-// #4180
-describe('readonly ref', () => {
-  const r = readonly(ref({ count: 1 }))
-  expectType<Ref>(r)
-})
-
-describe('should support markRaw', () => {
-  class Test<T> {
-    item = {} as Ref<T>
-  }
-  const test = new Test<number>()
-  const plain = {
-    ref: ref(1)
-  }
-
-  const r = reactive({
-    class: {
-      raw: markRaw(test),
-      reactive: test
-    },
-    plain: {
-      raw: markRaw(plain),
-      reactive: plain
-    }
-  })
-
-  expectType<Test<number>>(r.class.raw)
-  // @ts-expect-error it should unwrap
-  expectType<Test<number>>(r.class.reactive)
-
-  expectType<Ref<number>>(r.plain.raw.ref)
-  // @ts-expect-error it should unwrap
-  expectType<Ref<number>>(r.plain.reactive.ref)
-})
-
-describe('shallowReadonly ref unwrap', () => {
-  const r = shallowReadonly({ count: { n: ref(1) } })
-  // @ts-expect-error
-  r.count = 2
-  expectType<Ref>(r.count.n)
-  r.count.n.value = 123
-})
-
-// #3819
-describe('should unwrap tuple correctly', () => {
-  const readonlyTuple = [ref(0)] as const
-  const reactiveReadonlyTuple = reactive(readonlyTuple)
-  expectType<Ref<number>>(reactiveReadonlyTuple[0])
-
-  const tuple: [Ref<number>] = [ref(0)]
-  const reactiveTuple = reactive(tuple)
-  expectType<Ref<number>>(reactiveTuple[0])
-})
+import {
+  ref,
+  readonly,
+  shallowReadonly,
+  describe,
+  expectError,
+  expectType,
+  Ref,
+  reactive,
+  markRaw
+} from './index'
+
+describe('should support DeepReadonly', () => {
+  const r = readonly({ obj: { k: 'v' } })
+  // @ts-expect-error
+  expectError((r.obj = {}))
+  // @ts-expect-error
+  expectError((r.obj.k = 'x'))
+})
+
+// #4180
+describe('readonly ref', () => {
+  const r = readonly(ref({ count: 1 }))
+  expectType<Ref>(r)
+})
+
+describe('should support markRaw', () => {
+  class Test<T> {
+    item = {} as Ref<T>
+  }
+  const test = new Test<number>()
+  const plain = {
+    ref: ref(1)
+  }
+
+  const r = reactive({
+    class: {
+      raw: markRaw(test),
+      reactive: test
+    },
+    plain: {
+      raw: markRaw(plain),
+      reactive: plain
+    }
+  })
+
+  expectType<Test<number>>(r.class.raw)
+  // @ts-expect-error it should unwrap
+  expectType<Test<number>>(r.class.reactive)
+
+  expectType<Ref<number>>(r.plain.raw.ref)
+  // @ts-expect-error it should unwrap
+  expectType<Ref<number>>(r.plain.reactive.ref)
+})
+
+describe('shallowReadonly ref unwrap', () => {
+  const r = shallowReadonly({ count: { n: ref(1) } })
+  // @ts-expect-error
+  r.count = 2
+  expectType<Ref>(r.count.n)
+  r.count.n.value = 123
+})
+
+// #3819
+describe('should unwrap tuple correctly', () => {
+  const readonlyTuple = [ref(0)] as const
+  const reactiveReadonlyTuple = reactive(readonlyTuple)
+  expectType<Ref<number>>(reactiveReadonlyTuple[0])
+
+  const tuple: [Ref<number>] = [ref(0)]
+  const reactiveTuple = reactive(tuple)
+  expectType<Ref<number>>(reactiveTuple[0])
+})