diff --git a/src/PhpSpreadsheet/Reader/Xlsx.php b/src/PhpSpreadsheet/Reader/Xlsx.php
index 124cc3b252..4222b95422 100644
--- a/src/PhpSpreadsheet/Reader/Xlsx.php
+++ b/src/PhpSpreadsheet/Reader/Xlsx.php
@@ -488,7 +488,7 @@ public function load($pFilename)
                     }
                     if (!$this->readDataOnly && $xmlStyles) {
                         foreach ($xmlStyles->cellXfs->xf as $xf) {
-                            $numFmt = NumberFormat::FORMAT_GENERAL;
+                            $numFmt = null;
 
                             if ($xf['numFmtId']) {
                                 if (isset($numFmts)) {
@@ -503,6 +503,7 @@ public function load($pFilename)
                                 //  But there's a lot of naughty homebrew xlsx writers that do use "reserved" id values that aren't actually used
                                 //  So we make allowance for them rather than lose formatting masks
                                 if (
+                                    $numFmt === null &&
                                     (int) $xf['numFmtId'] < 164 &&
                                     NumberFormat::builtInFormatCode((int) $xf['numFmtId']) !== ''
                                 ) {
@@ -515,7 +516,7 @@ public function load($pFilename)
                             }
 
                             $style = (object) [
-                                'numFmt' => $numFmt,
+                                'numFmt' => $numFmt === null ? NumberFormat::FORMAT_GENERAL : $numFmt,
                                 'font' => $xmlStyles->fonts->font[(int) ($xf['fontId'])],
                                 'fill' => $xmlStyles->fills->fill[(int) ($xf['fillId'])],
                                 'border' => $xmlStyles->borders->border[(int) ($xf['borderId'])],