diff --git a/aio/content/marketing/contribute.html b/aio/content/marketing/contribute.html
index ecbe88aa39..3cca5037ab 100644
--- a/aio/content/marketing/contribute.html
+++ b/aio/content/marketing/contribute.html
@@ -14,7 +14,9 @@
       Angular is a next generation mobile and desktop application development platform.
 
     </div>
-    <a href="https://github.com/angular/angular/blob/master/CONTRIBUTING.md" class="button button-blue" md-button>Contribute</a>
+    <a href="https://github.com/angular/angular/blob/master/CONTRIBUTING.md" class="button button-blue" mat-button>
+      Contribute
+    </a>
   </div>
 
   <div class="card-section">
@@ -25,7 +27,9 @@
 
     </div>
 
-    <a href="https://github.com/angular/angular-cli/blob/master/CONTRIBUTING.md" class="button button-blue" md-button>Contribute</a>
+    <a href="https://github.com/angular/angular-cli/blob/master/CONTRIBUTING.md" class="button button-blue" mat-button>
+      Contribute
+    </a>
   </div>
 
   <div class="card-section">
@@ -37,7 +41,9 @@
 
     </div>
 
-    <a href="https://github.com/angular/material2/blob/master/CONTRIBUTING.md" class="button button-blue" md-button>Contribute</a>
+    <a href="https://github.com/angular/components/blob/master/CONTRIBUTING.md" class="button button-blue" mat-button>
+      Contribute
+    </a>
   </div>
 
   <div class="card-section">
@@ -48,7 +54,9 @@
       to build your Angular app.
 
     </div>
-    <a href="https://github.com/angular/angularfire2/blob/master/CONTRIBUTING.md" class="button button-blue" md-button> Contribute</a>
+    <a href="https://github.com/angular/angularfire/blob/master/CONTRIBUTING.md" class="button button-blue" mat-button>
+      Contribute
+    </a>
   </div>
 
 </article>