diff --git a/Spreadsheet/Excel/Writer.php b/Spreadsheet/Excel/Writer.php
index 2da963d..4eec27e 100644
--- a/Spreadsheet/Excel/Writer.php
+++ b/Spreadsheet/Excel/Writer.php
@@ -51,10 +51,10 @@ class Spreadsheet_Excel_Writer extends Spreadsheet_Excel_Writer_Workbook
     * @param string $filename The optional filename for the Workbook.
     * @return Spreadsheet_Excel_Writer_Workbook The Workbook created
     */
-    function Spreadsheet_Excel_Writer($filename = '')
+    function __construct($filename = '')
     {
         $this->_filename = $filename;
-        $this->Spreadsheet_Excel_Writer_Workbook($filename);
+        parent::__construct($filename);
     }
 
     /**
diff --git a/Spreadsheet/Excel/Writer/BIFFwriter.php b/Spreadsheet/Excel/Writer/BIFFwriter.php
index 1a2910b..cb08407 100644
--- a/Spreadsheet/Excel/Writer/BIFFwriter.php
+++ b/Spreadsheet/Excel/Writer/BIFFwriter.php
@@ -103,7 +103,7 @@ class Spreadsheet_Excel_Writer_BIFFwriter extends PEAR
     *
     * @access public
     */
-    public function Spreadsheet_Excel_Writer_BIFFwriter()
+    public function __construct()
     {
         $this->_byte_order = '';
         $this->_data       = '';
diff --git a/Spreadsheet/Excel/Writer/Format.php b/Spreadsheet/Excel/Writer/Format.php
index 9d9da69..c19d4e5 100644
--- a/Spreadsheet/Excel/Writer/Format.php
+++ b/Spreadsheet/Excel/Writer/Format.php
@@ -251,7 +251,7 @@ class Spreadsheet_Excel_Writer_Format extends PEAR
     * @param integer $index the XF index for the format.
     * @param array   $properties array with properties to be set on initialization.
     */
-    public function Spreadsheet_Excel_Writer_Format($BIFF_version, $index = 0, $properties =  array())
+    public function __construct($BIFF_version, $index = 0, $properties =  array())
     {
         $this->_xf_index       = $index;
         $this->_BIFF_version   = $BIFF_version;
diff --git a/Spreadsheet/Excel/Writer/Parser.php b/Spreadsheet/Excel/Writer/Parser.php
index e443290..9182f9b 100644
--- a/Spreadsheet/Excel/Writer/Parser.php
+++ b/Spreadsheet/Excel/Writer/Parser.php
@@ -171,7 +171,7 @@ class Spreadsheet_Excel_Writer_Parser extends PEAR
     * @param integer $byte_order The byte order (Little endian or Big endian) of the architecture
                                  (optional). 1 => big endian, 0 (default) little endian.
     */
-    public function Spreadsheet_Excel_Writer_Parser($byte_order, $biff_version)
+    public function __construct($byte_order, $biff_version)
     {
         $this->_current_char  = 0;
         $this->_BIFF_version  = $biff_version;
diff --git a/Spreadsheet/Excel/Writer/Validator.php b/Spreadsheet/Excel/Writer/Validator.php
index 5d8970f..6612315 100644
--- a/Spreadsheet/Excel/Writer/Validator.php
+++ b/Spreadsheet/Excel/Writer/Validator.php
@@ -67,7 +67,7 @@ class Spreadsheet_Excel_Writer_Validator
     */
     public $_parser;
 
-    public function Spreadsheet_Excel_Writer_Validator(&$parser)
+    public function __construct(&$parser)
     {
         $this->_parser       = $parser;
         $this->_type         = 0x01; // FIXME: add method for setting datatype
diff --git a/Spreadsheet/Excel/Writer/Workbook.php b/Spreadsheet/Excel/Writer/Workbook.php
index 6a3c3cb..7b5da14 100644
--- a/Spreadsheet/Excel/Writer/Workbook.php
+++ b/Spreadsheet/Excel/Writer/Workbook.php
@@ -182,10 +182,10 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
     * @param string filename for storing the workbook. "-" for writing to stdout.
     * @access public
     */
-    public function Spreadsheet_Excel_Writer_Workbook($filename)
+    public function __construct($filename)
     {
         // It needs to call its parent's constructor explicitly
-        $this->Spreadsheet_Excel_Writer_BIFFwriter();
+        parent::__construct();
 
         $this->_filename         = $filename;
         $this->_parser           = new Spreadsheet_Excel_Writer_Parser($this->_byte_order, $this->_BIFF_version);
diff --git a/Spreadsheet/Excel/Writer/Worksheet.php b/Spreadsheet/Excel/Writer/Worksheet.php
index 7485faf..0d73ca5 100644
--- a/Spreadsheet/Excel/Writer/Worksheet.php
+++ b/Spreadsheet/Excel/Writer/Worksheet.php
@@ -387,7 +387,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param string  $tmp_dir      The path to the directory for temporary files
     * @access private
     */
-    public function Spreadsheet_Excel_Writer_Worksheet($BIFF_version, $name,
+    public function __construct($BIFF_version, $name,
                                                 $index, &$activesheet,
                                                 &$firstsheet, &$str_total,
                                                 &$str_unique, &$str_table,
@@ -395,7 +395,7 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
                                                 $tmp_dir)
     {
         // It needs to call its parent's constructor explicitly
-        $this->Spreadsheet_Excel_Writer_BIFFwriter();
+        parent::__construct();
         $this->_BIFF_version   = $BIFF_version;
         $rowmax                = 65536; // 16384 in Excel 5
         $colmax                = 256;