diff --git a/src/PhpSpreadsheet/Reader/Xlsx.php b/src/PhpSpreadsheet/Reader/Xlsx.php
index 73f91852..8d38fa3e 100644
--- a/src/PhpSpreadsheet/Reader/Xlsx.php
+++ b/src/PhpSpreadsheet/Reader/Xlsx.php
@@ -717,6 +717,10 @@ class Xlsx extends BaseReader
                                                 } else {
                                                     // 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]);
+                                                    }
                                                 }
 
                                                 break;