diff --git a/Spreadsheet/Excel/Writer/Workbook.php b/Spreadsheet/Excel/Writer/Workbook.php
index a47dc33..ae95fba 100644
--- a/Spreadsheet/Excel/Writer/Workbook.php
+++ b/Spreadsheet/Excel/Writer/Workbook.php
@@ -337,8 +337,8 @@ class Spreadsheet_Excel_Writer_Workbook extends Spreadsheet_Excel_Writer_BIFFwri
                                    $this->_activesheet, $this->_firstsheet,
                                    $this->_str_total, $this->_str_unique,
                                    $this->_str_table, $this->_url_format,
-                                   $this->_parser);
-
+                                   $this->_parser, $this->_tmp_dir);
+        
         $this->_worksheets[$index] = &$worksheet;    // Store ref for iterator
         $this->_sheetnames[$index] = $name;          // Store EXTERNSHEET names
         $this->_parser->setExtSheet($name, $index);  // Register worksheet name with parser
diff --git a/Spreadsheet/Excel/Writer/Worksheet.php b/Spreadsheet/Excel/Writer/Worksheet.php
index c7bd8c7..8dfc2c1 100644
--- a/Spreadsheet/Excel/Writer/Worksheet.php
+++ b/Spreadsheet/Excel/Writer/Worksheet.php
@@ -364,13 +364,15 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
     * @param mixed   &$firstsheet  The first worksheet in the workbook we belong to
     * @param mixed   &$url_format  The default format for hyperlinks
     * @param mixed   &$parser      The formula parser created for the Workbook
+    * @param string  $tmp_dir      The path to the directory for temporary files
     * @access private
     */
     function Spreadsheet_Excel_Writer_Worksheet($BIFF_version, $name,
                                                 $index, &$activesheet,
                                                 &$firstsheet, &$str_total,
                                                 &$str_unique, &$str_table,
-                                                &$url_format, &$parser)
+                                                &$url_format, &$parser,
+                                                $tmp_dir)
     {
         // It needs to call its parent's constructor explicitly
         $this->Spreadsheet_Excel_Writer_BIFFwriter();
@@ -460,6 +462,8 @@ class Spreadsheet_Excel_Writer_Worksheet extends Spreadsheet_Excel_Writer_BIFFwr
         $this->_input_encoding    = '';
 
         $this->_dv                = array();
+        
+        $this->_tmp_dir = $tmp_dir;
 
         $this->_initialize();
     }
diff --git a/package.xml b/package.xml
index 8b0dfc6..7bc8542 100644
--- a/package.xml
+++ b/package.xml
@@ -46,6 +46,7 @@ http://pear.php.net/dtd/package-2.0.xsd">
   first value of the text [progi1984]
 - Fix Bug #14932: The name of the Workbook stream MUST be "Workbook", not
   "Book" [progi1984]
+- Fix Bug #14587: tmpfile() used despite setTempDir() [sberg]
  </notes>
 
  <contents>