diff --git a/packages/compiler/src/aot/static_reflector.ts b/packages/compiler/src/aot/static_reflector.ts
index c60b6dbe24..9964474086 100644
--- a/packages/compiler/src/aot/static_reflector.ts
+++ b/packages/compiler/src/aot/static_reflector.ts
@@ -235,7 +235,9 @@ export class StaticReflector implements CompileReflector {
         const prop = (<any[]>propData)
                          .find(a => a['__symbolic'] == 'property' || a['__symbolic'] == 'method');
         const decorators: any[] = [];
-        if (propMetadata![propName]) {
+        // hasOwnProperty() is used here to make sure we do not look up methods
+        // on `Object.prototype`.
+        if (propMetadata?.hasOwnProperty(propName)) {
           decorators.push(...propMetadata![propName]);
         }
         propMetadata![propName] = decorators;
diff --git a/packages/compiler/test/aot/static_reflector_spec.ts b/packages/compiler/test/aot/static_reflector_spec.ts
index d1ae5dd5a4..cf56450fbe 100644
--- a/packages/compiler/test/aot/static_reflector_spec.ts
+++ b/packages/compiler/test/aot/static_reflector_spec.ts
@@ -777,6 +777,35 @@ describe('StaticReflector', () => {
           .toEqual({});
     });
 
+    it('should not inherit methods from Object.prototype', () => {
+      const filePath = '/tmp/test.ts';
+      init({
+        ...DEFAULT_TEST_DATA,
+        [filePath]: `
+          import {Component} from '@angular/core';
+
+          @Component({
+            selector: 'test-component',
+          })
+          export class TestComponent {
+            title = 'Hello World';
+
+            toString() {
+              return 'Test Component';
+            }
+          }
+        `,
+      });
+      const declaration = reflector.getStaticSymbol(filePath, 'TestComponent');
+      expect(declaration.filePath).toBe(filePath);
+      expect(declaration.name).toBe('TestComponent');
+      const propMetadata = reflector.propMetadata(declaration);
+      // 'toString' is a member of TestComponent so it should be part of the metadata.
+      expect(propMetadata.hasOwnProperty('toString')).toBe(true);
+      // There are no decorators on 'toString' so it should be an empty array.
+      expect(propMetadata['toString']).toEqual([]);
+    });
+
     it('should inherit lifecycle hooks', () => {
       initWithDecorator({
         '/tmp/src/main.ts': `