diff --git a/apps/theming/lib/Controller/ThemingController.php b/apps/theming/lib/Controller/ThemingController.php
index 8957d30588..692a0f6234 100644
--- a/apps/theming/lib/Controller/ThemingController.php
+++ b/apps/theming/lib/Controller/ThemingController.php
@@ -383,7 +383,7 @@ class ThemingController extends Controller {
 						'src' => $this->urlGenerator->linkToRoute('theming.Icon.getTouchIcon',
 								['app' => $app]) . '?v=' . $cacheBusterValue,
 						'type' => 'image/png',
-						'sizes' => '128x128'
+						'sizes' => '512x512'
 					],
 					[
 						'src' => $this->urlGenerator->linkToRoute('theming.Icon.getFavicon',