diff --git a/src/PhpSpreadsheet/Reader/Xlsx.php b/src/PhpSpreadsheet/Reader/Xlsx.php
index 8d38fa3e..9a5e5e2d 100644
--- a/src/PhpSpreadsheet/Reader/Xlsx.php
+++ b/src/PhpSpreadsheet/Reader/Xlsx.php
@@ -719,7 +719,7 @@ class Xlsx extends BaseReader
                                                     $this->castToFormula($c, $r, $cellDataType, $value, $calculatedValue, $sharedFormulas, 'castToString');
                                                     if (isset($c->f['t'])) {
                                                         $att = $c->f['t'];
-                                                        $docSheet->getCell($r)->setFormulaAttributes(['t' => (string)$att]);
+                                                        $docSheet->getCell($r)->setFormulaAttributes(['t' => (string) $att]);
                                                     }
                                                 }