diff --git a/app/code/Magento/Theme/Block/Html/Topmenu.php b/app/code/Magento/Theme/Block/Html/Topmenu.php
index 4bb77dbfff00e470b87d840db22885a030907c31..ed3445e1173314a0634212dd0c998b3bf3aa81fd 100644
--- a/app/code/Magento/Theme/Block/Html/Topmenu.php
+++ b/app/code/Magento/Theme/Block/Html/Topmenu.php
@@ -235,12 +235,12 @@ class Topmenu extends Template implements IdentityInterface
 
             if ($childLevel == 0 && $outermostClass) {
                 $outermostClassCode = ' class="' . $outermostClass . '" ';
-                $current_class = $child->getClass();
+                $currentClass = $child->getClass();
 
-                if (empty($current_class)) {
+                if (empty($currentClass)) {
                     $child->setClass($outermostClass);
                 } else {
-                    $child->setClass($current_class . ' ' . $outermostClass);
+                    $child->setClass($currentClass . ' ' . $outermostClass);
                 }
             }