diff --git a/src/PhpSpreadsheet/Reader/Xlsx.php b/src/PhpSpreadsheet/Reader/Xlsx.php
index 1eab5ef3..2b37896d 100644
--- a/src/PhpSpreadsheet/Reader/Xlsx.php
+++ b/src/PhpSpreadsheet/Reader/Xlsx.php
@@ -722,8 +722,8 @@ class Xlsx extends BaseReader
                                                     // Formula
                                                     $this->castToFormula($c, $r, $cellDataType, $value, $calculatedValue, $sharedFormulas, 'castToString');
                                                     if (isset($c->f['t'])) {
-                                                        $att = $c->f['t'];
-                                                        $docSheet->getCell($r)->setFormulaAttributes(['t' => (string) $att]);
+                                                        $attributes = $c->f['t'];
+                                                        $docSheet->getCell($r)->setFormulaAttributes(['t' => (string) $attributes]);
                                                     }
                                                 }