diff --git a/include/tcpdf_fonts.php b/include/tcpdf_fonts.php
index fbe7009c..fc75e0f2 100644
--- a/include/tcpdf_fonts.php
+++ b/include/tcpdf_fonts.php
@@ -1384,7 +1384,7 @@ public static function _getTrueTypeFontSubset($font, $subsetchars) {
 		}
 		// set checkSumAdjustment on head table
 		$checkSumAdjustment = 0xB1B0AFBA - self::_getTTFtableChecksum($font, strlen($font));
-		$font = substr($font, 0, $table['head']['offset'] + $offset + 8).pack('N', $checkSumAdjustment).substr($font, $table['head']['offset'] + $offset + 12);
+		$font = substr($font, 0, $table['head']['offset'] + $offset + 4).pack('N', $checkSumAdjustment).substr($font, $table['head']['offset'] + $offset + 8);
 		return $font;
 	}