diff --git a/src/Illuminate/Support/Str.php b/src/Illuminate/Support/Str.php
index 9e84b3cd73da..8fb350f623e6 100644
--- a/src/Illuminate/Support/Str.php
+++ b/src/Illuminate/Support/Str.php
@@ -641,11 +641,11 @@ public static function markdown($string, array $options = [], array $extensions
     {
         $converter = new GithubFlavoredMarkdownConverter($options);
 
-		$environment = $converter->getEnvironment();
+        $environment = $converter->getEnvironment();
 
-		foreach ($extensions as $extension) {
-			$environment->addExtension($extension);
-		}
+        foreach ($extensions as $extension) {
+            $environment->addExtension($extension);
+        }
 
         return (string) $converter->convert($string);
     }