diff --git a/examples/api-samples/src/browser/style/branding.css b/examples/api-samples/src/browser/style/branding.css
index e414960b0466a..a969d1e2b9d42 100644
--- a/examples/api-samples/src/browser/style/branding.css
+++ b/examples/api-samples/src/browser/style/branding.css
@@ -27,3 +27,8 @@
     background-repeat: no-repeat;
     background-size: 15%;
 }
+
+.unclosable-window-icon {
+    -webkit-mask: url('window-icon.svg');
+    mask: url('window-icon.svg');
+}
diff --git a/examples/api-samples/src/browser/style/window-icon.svg b/examples/api-samples/src/browser/style/window-icon.svg
new file mode 100644
index 0000000000000..b7cd62ad53907
--- /dev/null
+++ b/examples/api-samples/src/browser/style/window-icon.svg
@@ -0,0 +1,4 @@
+<!--Copyright (c) Microsoft Corporation. All rights reserved.-->
+<!--Copyright (C) 2019 TypeFox and others.-->
+<!--Licensed under the MIT License. See License.txt in the project root for license information.-->
+<svg fill="#F6F6F6" height="28" viewBox="0 0 28 28" width="28" xmlns="http://www.w3.org/2000/svg"><g fill="#F6F6F6"><path clip-rule="evenodd" d="m3 3h10v4h-6v6 2 6h6v4h-10zm18 12v6h-6v4h10v-10zm4-2v-10h-10v4h3v-1h4v4h-1v3z" fill-rule="evenodd"/><path d="m9 9h10v10h-10z"/></g></svg>
diff --git a/examples/api-samples/src/browser/view/sample-unclosable-view.tsx b/examples/api-samples/src/browser/view/sample-unclosable-view.tsx
index 297508559e564..71050d10d61ac 100644
--- a/examples/api-samples/src/browser/view/sample-unclosable-view.tsx
+++ b/examples/api-samples/src/browser/view/sample-unclosable-view.tsx
@@ -14,7 +14,7 @@
  * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
  ********************************************************************************/
 
-import { codicon, ReactWidget } from '@theia/core/lib/browser';
+import { ReactWidget } from '@theia/core/lib/browser';
 import { injectable, postConstruct } from '@theia/core/shared/inversify';
 import * as React from '@theia/core/shared/react';
 
@@ -30,7 +30,7 @@ export class SampleViewUnclosableView extends ReactWidget {
     this.id = SampleViewUnclosableView.ID;
     this.title.caption = 'Sample Unclosable View';
     this.title.label = 'Sample Unclosable View';
-    this.title.iconClass = codicon('window');
+    this.title.iconClass = 'unclosable-window-icon';
     this.title.closable = false;
     this.update();
   }