diff --git a/libs/ng-mocks/src/lib/common/func.is-standalone.spec.ts b/libs/ng-mocks/src/lib/common/func.is-standalone.spec.ts
new file mode 100644
index 0000000000..c59e2c09af
--- /dev/null
+++ b/libs/ng-mocks/src/lib/common/func.is-standalone.spec.ts
@@ -0,0 +1,33 @@
+import { Component, VERSION } from '@angular/core';
+
+import { isStandalone } from './func.is-standalone';
+
+@Component({
+  selector: 'standalone',
+  template: `<div>
+    <h1>Angular 19 standalone</h1>
+  </div>`,
+})
+class StandaloneComponent {}
+
+describe('func.is-standalone', () => {
+  describe('Angular  Angular 19+ specific tests', () => {
+    let originalVersion: { major: string };
+    const setVersionMajor = (major: number) => {
+      Object.assign(VERSION, { major: major.toString() });
+    };
+
+    beforeAll(() => {
+      originalVersion = { ...VERSION };
+    });
+
+    afterEach(() => {
+      Object.assign(VERSION, originalVersion);
+    });
+
+    it('should return true when standalone is undefined', () => {
+      setVersionMajor(19);
+      expect(isStandalone(StandaloneComponent)).toBeTruthy();
+    });
+  });
+});
diff --git a/libs/ng-mocks/src/lib/common/func.is-standalone.ts b/libs/ng-mocks/src/lib/common/func.is-standalone.ts
index 621d1415b9..f600d5d225 100644
--- a/libs/ng-mocks/src/lib/common/func.is-standalone.ts
+++ b/libs/ng-mocks/src/lib/common/func.is-standalone.ts
@@ -1,3 +1,5 @@
+import { VERSION } from '@angular/core';
+
 import collectDeclarations from '../resolve/collect-declarations';
 
 import { getNgType } from './func.get-ng-type';
@@ -11,5 +13,11 @@ export function isStandalone(declaration: any): boolean {
     return false;
   }
 
-  return collectDeclarations(declaration)[type].standalone === true;
+  // Handle Angular 19+ default standalone behavior
+  const declarations = collectDeclarations(declaration);
+  if (Number(VERSION.major) >= 19 && type !== 'NgModule' && declarations[type].standalone === undefined) {
+    return true;
+  }
+
+  return declarations[type].standalone === true;
 }
diff --git a/libs/ng-mocks/src/lib/mock-render/func.create-wrapper.ts b/libs/ng-mocks/src/lib/mock-render/func.create-wrapper.ts
index fddb8e5927..601b523c32 100644
--- a/libs/ng-mocks/src/lib/mock-render/func.create-wrapper.ts
+++ b/libs/ng-mocks/src/lib/mock-render/func.create-wrapper.ts
@@ -140,6 +140,7 @@ export default (
     selector: 'mock-render',
     template: mockTemplate,
     viewProviders: flags.viewProviders,
+    standalone: false,
   };
 
   ctor = generateWrapperComponent({ ...meta, bindings, options });