diff --git a/src/Spout/Writer/XLSX/Manager/Style/StyleManager.php b/src/Spout/Writer/XLSX/Manager/Style/StyleManager.php
index f8365c9..f83f16b 100644
--- a/src/Spout/Writer/XLSX/Manager/Style/StyleManager.php
+++ b/src/Spout/Writer/XLSX/Manager/Style/StyleManager.php
@@ -233,6 +233,7 @@ EOD;
             }
 
             $content .= sprintf(' applyBorder="%d"', $style->shouldApplyBorder() ? 1 : 0);
+            $content .= sprintf(' applyNumberFormat="%d"', $style->shouldApplyNumberFormat() ? 1 : 0);
 
             if ($style->shouldWrapText()) {
                 $content .= ' applyAlignment="1">';