diff --git a/Classes/PHPExcel/Writer/HTML.php b/Classes/PHPExcel/Writer/HTML.php
index be909b1..08a2676 100644
--- a/Classes/PHPExcel/Writer/HTML.php
+++ b/Classes/PHPExcel/Writer/HTML.php
@@ -229,7 +229,7 @@ class PHPExcel_Writer_HTML implements PHPExcel_Writer_IWriter {
 	 */
 	private function _mapBorderStyle($borderStyle) {
 		switch ($borderStyle) {
-			case PHPExcel_Style_Border::BORDER_NONE:				return '0px';
+			case PHPExcel_Style_Border::BORDER_NONE:				return '1px hidden';
 			case PHPExcel_Style_Border::BORDER_DASHDOT:				return '1px dashed';
 			case PHPExcel_Style_Border::BORDER_DASHDOTDOT:			return '1px dotted';
 			case PHPExcel_Style_Border::BORDER_DASHED:				return '1px dashed';
@@ -905,7 +905,11 @@ class PHPExcel_Writer_HTML implements PHPExcel_Writer_IWriter {
 			$style = isset($this->_cssStyles['table']) ?
 				$this->_assembleCSS($this->_cssStyles['table']) : '';
 
-			$html .= '	<table border="0" cellpadding="1" id="sheet' . $sheetIndex . '" cellspacing="4" style="' . $style . '">' . PHP_EOL;
+			if ($this->_isPdf && $pSheet->getShowGridLines()) {
+				$html .= '	<table border="1" cellpadding="1" id="sheet' . $sheetIndex . '" cellspacing="4" style="' . $style . '">' . PHP_EOL;
+			} else {
+				$html .= '	<table border="0" cellpadding="1" id="sheet' . $sheetIndex . '" cellspacing="4" style="' . $style . '">' . PHP_EOL;
+			}
 		}
 
 		// Write <col> elements