diff --git a/libs/ng-mocks/src/lib/mock-helper/mock-helper.stub-member.ts b/libs/ng-mocks/src/lib/mock-helper/mock-helper.stub-member.ts
index f16565df8a..1ce0c8c3fb 100644
--- a/libs/ng-mocks/src/lib/mock-helper/mock-helper.stub-member.ts
+++ b/libs/ng-mocks/src/lib/mock-helper/mock-helper.stub-member.ts
@@ -1,5 +1,18 @@
-export default <T extends object>(instance: T, key: any, value: any, encapsulation?: 'get' | 'set'): any => {
-  const def = Object.getOwnPropertyDescriptor(instance, key) || {};
+import helperExtractPropertyDescriptor from '../mock-service/helper.extract-property-descriptor';
+
+export default <T extends object>(
+  instance: T & { __ngMocks__source?: object },
+  key: any,
+  value: any,
+  encapsulation?: 'get' | 'set',
+): any => {
+  const def = helperExtractPropertyDescriptor(instance, key) ?? {};
+
+  if (!encapsulation && def.set && (def.set as any).__ngMocksProxy) {
+    def.set(value);
+
+    return value;
+  }
 
   const descriptor: PropertyDescriptor = {
     configurable: true,
diff --git a/libs/ng-mocks/src/lib/mock-render/func.install-prop-reader.ts b/libs/ng-mocks/src/lib/mock-render/func.install-prop-reader.ts
index 1a566b29ce..cc899538b2 100644
--- a/libs/ng-mocks/src/lib/mock-render/func.install-prop-reader.ts
+++ b/libs/ng-mocks/src/lib/mock-render/func.install-prop-reader.ts
@@ -2,8 +2,8 @@ import coreDefineProperty from '../common/core.define-property';
 import helperDefinePropertyDescriptor from '../mock-service/helper.define-property-descriptor';
 import helperMockService from '../mock-service/helper.mock-service';
 
-const createPropertyGet =
-  (key: keyof any & string, reader: Record<keyof any, any>, source: Record<keyof any, any>) => () => {
+const createPropertyGet = (key: keyof any & string, reader: Record<keyof any, any>, source: Record<keyof any, any>) => {
+  const handler = () => {
     if (typeof source[key] === 'function') {
       if (reader[`__ngMocks_${key}__origin`] !== source[key]) {
         const clone = helperMockService.createClone(source[key], reader, source);
@@ -16,9 +16,13 @@ const createPropertyGet =
 
     return source[key];
   };
+  coreDefineProperty(handler, '__ngMocksProxy', true, false);
 
-const createPropertySet =
-  (key: keyof any & string, reader: Record<keyof any, any>, source: Record<keyof any, any>) => (newValue: any) => {
+  return handler;
+};
+
+const createPropertySet = (key: keyof any & string, reader: Record<keyof any, any>, source: Record<keyof any, any>) => {
+  const handler = (newValue: any) => {
     if (reader[`__ngMocks_${key}`]) {
       reader[`__ngMocks_${key}`] = undefined;
     }
@@ -27,6 +31,10 @@ const createPropertySet =
     }
     source[key] = newValue;
   };
+  coreDefineProperty(handler, '__ngMocksProxy', true, false);
+
+  return handler;
+};
 
 const extractAllKeys = (instance: object) => [
   ...helperMockService.extractPropertiesFromPrototype(Object.getPrototypeOf(instance)),
@@ -45,6 +53,7 @@ export default (
   if (!source) {
     return;
   }
+  coreDefineProperty(reader, '__ngMocks__source', source, false);
   const exists = extractOwnKeys(reader);
   const fields = [...extractAllKeys(source), ...extra];
   for (const key of fields) {
diff --git a/tests/issue-1165/test.spec.ts b/tests/issue-1165/test.spec.ts
new file mode 100644
index 0000000000..ecd9e34bc5
--- /dev/null
+++ b/tests/issue-1165/test.spec.ts
@@ -0,0 +1,44 @@
+import { Component } from '@angular/core';
+import { MockBuilder, MockRender, ngMocks } from 'ng-mocks';
+
+@Component({
+  selector: 'target',
+  template: `{{ value }}`,
+})
+class TargetComponent {
+  private valueOrigin = 0;
+
+  public get value(): number {
+    return this.valueOrigin;
+  }
+
+  public set value(value: number) {
+    this.valueOrigin = value;
+  }
+}
+
+// @see https://github.com/ike18t/ng-mocks/issues/1165
+describe('issue-1165', () => {
+  beforeEach(() => MockBuilder(TargetComponent));
+
+  it('sets values via proxy', () => {
+    const fixture = MockRender(TargetComponent);
+    expect(ngMocks.formatText(fixture)).toEqual('0');
+
+    fixture.componentInstance.value = 1;
+    fixture.detectChanges();
+    expect(ngMocks.formatText(fixture)).toEqual('1');
+
+    fixture.point.componentInstance.value = 2;
+    fixture.detectChanges();
+    expect(ngMocks.formatText(fixture)).toEqual('2');
+
+    ngMocks.stubMember(fixture.componentInstance, 'value', 3);
+    fixture.detectChanges();
+    expect(ngMocks.formatText(fixture)).toEqual('3');
+
+    ngMocks.stubMember(fixture.point.componentInstance, 'value', 4);
+    fixture.detectChanges();
+    expect(ngMocks.formatText(fixture)).toEqual('4');
+  });
+});