diff --git a/src/Spout/Writer/Internal/XLSX/Worksheet.php b/src/Spout/Writer/Internal/XLSX/Worksheet.php
index 101cb00..124feb2 100644
--- a/src/Spout/Writer/Internal/XLSX/Worksheet.php
+++ b/src/Spout/Writer/Internal/XLSX/Worksheet.php
@@ -141,6 +141,7 @@ EOD;
                 case gettype($cellValue) === 'integer':
                 case gettype($cellValue) === 'boolean':
                 case gettype($cellValue) === 'float':
+                case gettype($cellValue) === 'double':
                     $data .= '><v>' . $cellValue . '</v></c>' . PHP_EOL;
                     break;
                 case gettype($cellValue) === 'object' && method_exists($cellValue, '__toString'):