diff --git a/src/Spout/Writer/XLSX/Manager/WorksheetManager.php b/src/Spout/Writer/XLSX/Manager/WorksheetManager.php
index 1c45c5a..3a4649f 100644
--- a/src/Spout/Writer/XLSX/Manager/WorksheetManager.php
+++ b/src/Spout/Writer/XLSX/Manager/WorksheetManager.php
@@ -160,7 +160,7 @@ EOD;
         $rowXML = '<row r="' . $rowIndex . '" spans="1:' . $numCells . '">';
 
         $cells = $row->getCells();
-        for($cell_index=0;$cell_index<$numCells;$cell_index++) {
+        for ($cell_index=0; $cell_index<$numCells; $cell_index++) {
             if(isset($cells[$cell_index])) {
                 $rowXML .= $this->applyStyleAndGetCellXML($cells[$cell_index], $rowStyle, $rowIndex, $cell_index);
             }