diff --git a/src/Illuminate/Routing/Router.php b/src/Illuminate/Routing/Router.php
index 92061f1b86b4..45a784501cc7 100644
--- a/src/Illuminate/Routing/Router.php
+++ b/src/Illuminate/Routing/Router.php
@@ -530,7 +530,7 @@ protected function prependGroupNamespace($class)
     {
         $group = end($this->groupStack);
 
-        return isset($group['namespace']) && strpos($class, '\\') !== 0 && !Str::startsWith($class, $group['namespace'])
+        return isset($group['namespace']) && strpos($class, '\\') !== 0 && ! Str::startsWith($class, $group['namespace'])
                 ? $group['namespace'].'\\'.$class : $class;
     }