diff --git a/src/PhpSpreadsheet/Helper/Sample.php b/src/PhpSpreadsheet/Helper/Sample.php
index d021c922ca..c637e1198b 100644
--- a/src/PhpSpreadsheet/Helper/Sample.php
+++ b/src/PhpSpreadsheet/Helper/Sample.php
@@ -141,7 +141,7 @@ private function getTemporaryFolder()
     {
         $tempFolder = sys_get_temp_dir() . '/phpspreadsheet';
         if (!is_dir($tempFolder)) {
-            if (! mkdir($tempFolder) && ! is_dir($tempFolder)) {
+            if (!mkdir($tempFolder) && !is_dir($tempFolder)) {
                 throw new \RuntimeException(sprintf('Directory "%s" was not created', $tempFolder));
             }
         }