diff --git a/src/PhpSpreadsheet/Writer/CSV.php b/src/PhpSpreadsheet/Writer/CSV.php
index 3bcee0ca..5036b43b 100644
--- a/src/PhpSpreadsheet/Writer/CSV.php
+++ b/src/PhpSpreadsheet/Writer/CSV.php
@@ -71,6 +71,14 @@ class CSV extends BaseWriter implements IWriter
      */
     private $useBOM = false;
 
+    /**
+     * Whether to write a Separator line as the first line of the file
+     *     sep=x
+     *
+     * @var boolean
+     */
+    private $includeSeparatorLine = false;
+
     /**
      * Whether to write a fully Excel compatible CSV file.
      *
@@ -111,15 +119,20 @@ class CSV extends BaseWriter implements IWriter
         }
 
         if ($this->excelCompatibility) {
-            fwrite($fileHandle, "\xEF\xBB\xBF");    //    Enforce UTF-8 BOM Header
-            $this->setEnclosure('"');                //    Set enclosure to "
-            $this->setDelimiter(";");                //    Set delimiter to a semi-colon
+            $this->setUseBOM(true);                //  Enforce UTF-8 BOM Header
+            $this->setIncludeSeparatorLine(true);  //  Set separator line
+            $this->setEnclosure('"');              //  Set enclosure to "
+            $this->setDelimiter(";");              //  Set delimiter to a semi-colon
             $this->setLineEnding("\r\n");
-            fwrite($fileHandle, 'sep=' . $this->getDelimiter() . $this->lineEnding);
-        } elseif ($this->useBOM) {
+        }
+        if ($this->useBOM) {
             // Write the UTF-8 BOM code if required
             fwrite($fileHandle, "\xEF\xBB\xBF");
         }
+        if ($this->includeSeparatorLine) {
+            // Write the separator line if required
+            fwrite($fileHandle, 'sep=' . $this->getDelimiter() . $this->lineEnding);
+        }
 
         //    Identify the range that we need to extract from the worksheet
         $maxCol = $sheet->getHighestDataColumn();
@@ -231,6 +244,28 @@ class CSV extends BaseWriter implements IWriter
         return $this;
     }
 
+    /**
+     * Get whether a separator line should be included
+     *
+     * @return boolean
+     */
+    public function getIncludeSeparatorLine()
+    {
+        return $this->includeSeparatorLine;
+    }
+
+    /**
+     * Set whether a separator line should be included as the first line of the file
+     *
+     * @param    boolean    $pValue        Use separator line? Defaults to false
+     * @return PHPExcel_Writer_CSV
+     */
+    public function setIncludeSeparatorLine($pValue = false)
+    {
+        $this->includeSeparatorLine = $pValue;
+        return $this;
+    }
+
     /**
      * Get whether the file should be saved with full Excel Compatibility
      *