diff --git a/src/PhpSpreadsheet/Reader/Csv.php b/src/PhpSpreadsheet/Reader/Csv.php
index 76bac01a..6adb6ee6 100644
--- a/src/PhpSpreadsheet/Reader/Csv.php
+++ b/src/PhpSpreadsheet/Reader/Csv.php
@@ -195,11 +195,11 @@ class Csv extends BaseReader
             }
 
             $meanSquareDeviations[$delimiter] = array_reduce(
-                    $series,
-                    function ($sum, $value) use ($median) {
-                        return $sum + pow($value - $median, 2);
-                    }
-                ) / count($series);
+                $series,
+                function ($sum, $value) use ($median) {
+                    return $sum + pow($value - $median, 2);
+                }
+            ) / count($series);
         }
 
         // ... and pick the delimiter with the smallest mean square deviation (in case of ties, the order in potentialDelimiters is respected)