diff --git a/Classes/PHPExcel/Writer/Excel5/Worksheet.php b/Classes/PHPExcel/Writer/Excel5/Worksheet.php
index c864904c..a812a642 100644
--- a/Classes/PHPExcel/Writer/Excel5/Worksheet.php
+++ b/Classes/PHPExcel/Writer/Excel5/Worksheet.php
@@ -256,6 +256,7 @@ class PHPExcel_Writer_Excel5_Worksheet extends PHPExcel_Writer_Excel5_BIFFwriter
 
 		$this->_firstColumnIndex	= (count($col) > 0) ? PHPExcel_Cell::columnIndexFromString(substr(min($col),1)) : 1;
 		$this->_lastColumnIndex		= (count($col) > 0) ? PHPExcel_Cell::columnIndexFromString(substr(max($col),1)) : 1;
+
 		if ($this->_firstColumnIndex > 255) $this->_firstColumnIndex = 255;
 		if ($this->_lastColumnIndex > 255) $this->_lastColumnIndex = 255;
 
@@ -289,8 +290,9 @@ class PHPExcel_Writer_Excel5_Worksheet extends PHPExcel_Writer_Excel5_BIFFwriter
 		$this->_phpSheet->calculateColumnWidths();
 
 		// Column dimensions
+		$maxCol = PHPExcel_Cell::columnIndexFromString($this->_phpSheet->getHighestColumn()) -1;
 		$columnDimensions = $this->_phpSheet->getColumnDimensions();
-		for ($i = 0; $i < 256; ++$i) {
+		for ($i = 0; $i <= $maxCol; ++$i) {
 			$hidden = 0;
 			$level = 0;
 			$xfIndex = 15; // there are 15 cell style Xfs
@@ -1237,6 +1239,8 @@ class PHPExcel_Writer_Excel5_Worksheet extends PHPExcel_Writer_Excel5_BIFFwriter
 				);
 		}
 
+		hexdump($data);
+
 		$header = pack("vv", $record, $length);
 		$this->_append($header.$data);
 	}
diff --git a/changelog.txt b/changelog.txt
index 94b0d7ad..3b28d570 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -52,6 +52,7 @@ Fixed in SVN:
 - Bugfix:	(MBaker) Work item 15172 - rangeToarray function modified for non-existent cells
 - Bugfix:	(MBaker) Work item 14980 - Images not getting copyied with the ->clone function
 - Bugfix:	(MBaker) Work item 11576 - AdvancedValueBinder.php: String sometimes becomes a date when it shouldn't
+- Bugfix:	(MBaker) Fix Excel5 Writer so that it only writes column dimensions for columns that are actually used rather than the full range (A to IV)
 - General:  (MBaker) Improved performance (speed), for building the Shared Strings table in the Excel2007 Writer.