diff --git a/apps/theming/lib/Controller/ThemingController.php b/apps/theming/lib/Controller/ThemingController.php
index b7777f1f90..5fd6edd8ab 100644
--- a/apps/theming/lib/Controller/ThemingController.php
+++ b/apps/theming/lib/Controller/ThemingController.php
@@ -176,7 +176,7 @@ class ThemingController extends Controller {
 		$this->themingDefaults->set($setting, $value);
 
 		// reprocess server scss for preview
-		$cssCached = $this->scssCacher->process(\OC::$SERVERROOT, '/core/css/server.scss', 'core');
+		$cssCached = $this->scssCacher->process(\OC::$SERVERROOT, 'core/css/server.scss', 'core');
 
 		return new DataResponse(
 			[