diff --git a/src/PhpSpreadsheet/Calculation/LookupRef/ExcelMatch.php b/src/PhpSpreadsheet/Calculation/LookupRef/ExcelMatch.php
index 5cd70de9e..668290e00 100644
--- a/src/PhpSpreadsheet/Calculation/LookupRef/ExcelMatch.php
+++ b/src/PhpSpreadsheet/Calculation/LookupRef/ExcelMatch.php
@@ -63,7 +63,6 @@ class ExcelMatch
             $lookupValue = StringHelper::strToLower($lookupValue);
         }
 
-        $valueKey = null;
         $valueKey = match ($matchType) {
             self::MATCHTYPE_LARGEST_VALUE => self::matchLargestValue($lookupArray, $lookupValue, $keySet),
             self::MATCHTYPE_FIRST_VALUE => self::matchFirstValue($lookupArray, $lookupValue),