diff --git a/src/material-examples/stepper-vertical/stepper-vertical-example.ts b/src/material-examples/stepper-vertical/stepper-vertical-example.ts
index ba958383b4f5..13229872f1fd 100644
--- a/src/material-examples/stepper-vertical/stepper-vertical-example.ts
+++ b/src/material-examples/stepper-vertical/stepper-vertical-example.ts
@@ -1,4 +1,4 @@
-import {Component} from '@angular/core';
+import {Component, OnInit} from '@angular/core';
 import {FormBuilder, FormGroup, Validators} from '@angular/forms';
 
 /**
@@ -9,7 +9,7 @@ import {FormBuilder, FormGroup, Validators} from '@angular/forms';
   templateUrl: 'stepper-vertical-example.html',
   styleUrls: ['stepper-vertical-example.css']
 })
-export class StepperVerticalExample {
+export class StepperVerticalExample implements OnInit {
   isLinear = false;
   firstFormGroup: FormGroup;
   secondFormGroup: FormGroup;