diff --git a/src/WPDesk/Notice/Notice.php b/src/WPDesk/Notice/Notice.php
index 436c01f2e0aea2db1c9a4ad5b3ee2a6430d8c893..489b4296c9cdf265ed0c563e92fcbd18f9b5d0ea 100644
--- a/src/WPDesk/Notice/Notice.php
+++ b/src/WPDesk/Notice/Notice.php
@@ -245,7 +245,7 @@ class Notice
             $notice_class .= ' ' . $this->attributes['class'];
         }
         if ($this->showInGutenberg) {
-            $notice_class .= 'wpdesk-notice-gutenberg';
+            $notice_class .= ' wpdesk-notice-gutenberg';
         }
         return $notice_class;
     }