diff --git a/apps/theming/lib/controller/themingcontroller.php b/apps/theming/lib/controller/themingcontroller.php
index 8c03060f884af043abdbb341bdb3c8437d6de349..61bc0b86bf47b15405967401d00a7d804b746b60 100644
--- a/apps/theming/lib/controller/themingcontroller.php
+++ b/apps/theming/lib/controller/themingcontroller.php
@@ -261,7 +261,7 @@ class ThemingController extends Controller {
 		$backgroundLogo = $this->config->getAppValue($this->appName, 'backgroundMime');
 		if($backgroundLogo !== '') {
 			$responseCss .= '#body-login {background-image: url(\'./loginbackground?v='.$cacheBusterValue.'\');}' . "\n";
-			$responseCss .= 'firstrunwizard .firstrunwizard-header {' .
+			$responseCss .= '#firstrunwizard .firstrunwizard-header {' .
 				'background-image: url(\'./loginbackground?v='.$cacheBusterValue.'\');' .
 			'}' . "\n";
 		}
diff --git a/apps/theming/tests/lib/controller/ThemingControllerTest.php b/apps/theming/tests/lib/controller/ThemingControllerTest.php
index 253c263916f9635116dd4af91bfdfabc3a18c0d4..0cbf125d8fd685c4356decc4fc18dfb027fd6a7e 100644
--- a/apps/theming/tests/lib/controller/ThemingControllerTest.php
+++ b/apps/theming/tests/lib/controller/ThemingControllerTest.php
@@ -486,7 +486,7 @@ class ThemingControllerTest extends TestCase {
 			->willReturn('text/svg');
 
 		$expectedData = '#body-login {background-image: url(\'./loginbackground?v=0\');}' . "\n";
-		$expectedData .= 'firstrunwizard .firstrunwizard-header {' .
+		$expectedData .= '#firstrunwizard .firstrunwizard-header {' .
 			'background-image: url(\'./loginbackground?v=0\');' .
 			'}' . "\n";
 
@@ -559,7 +559,7 @@ class ThemingControllerTest extends TestCase {
 			'}' . "\n"
 		);
 		$expectedData .= '#body-login {background-image: url(\'./loginbackground?v=0\');}' . "\n";
-		$expectedData .= 'firstrunwizard .firstrunwizard-header {' .
+		$expectedData .= '#firstrunwizard .firstrunwizard-header {' .
 			'background-image: url(\'./loginbackground?v=0\');' .
 			'}' . "\n";
 		$expected = new Http\DataDownloadResponse($expectedData, 'style', 'text/css');
@@ -631,7 +631,7 @@ class ThemingControllerTest extends TestCase {
 			'}' . "\n"
 		);
 		$expectedData .= '#body-login {background-image: url(\'./loginbackground?v=0\');}' . "\n";
-		$expectedData .= 'firstrunwizard .firstrunwizard-header {' .
+		$expectedData .= '#firstrunwizard .firstrunwizard-header {' .
 			'background-image: url(\'./loginbackground?v=0\');' .
 			'}' . "\n";
 		$expectedData .= '#header .header-appname, #expandDisplayName { color: #000000; }' . "\n";