diff --git a/app/code/Magento/Theme/Controller/Result/AsyncCssPlugin.php b/app/code/Magento/Theme/Controller/Result/AsyncCssPlugin.php
index a3f054d7c8dc7..f0c343c366abc 100644
--- a/app/code/Magento/Theme/Controller/Result/AsyncCssPlugin.php
+++ b/app/code/Magento/Theme/Controller/Result/AsyncCssPlugin.php
@@ -58,9 +58,9 @@ function ($matches) use (&$cssMatches) {
                     }
                     $media = $media ?? 'all';
                     $loadCssAsync = sprintf(
-                        '<link rel="preload" as="style" media="%s" .
-                         onload="this.onload=null;this.rel=\'stylesheet\'"' .
-                        'href="%s">',
+                        '<link rel="preload" as="style" media="%s"' .
+                         ' onload="this.onload=null;this.rel=\'stylesheet\'"' .
+                        ' href="%s">',
                         $media,
                         $href
                     );