diff --git a/Classes/PHPExcel/Style.php b/Classes/PHPExcel/Style.php
index 61ad53b2..badc3153 100644
--- a/Classes/PHPExcel/Style.php
+++ b/Classes/PHPExcel/Style.php
@@ -610,9 +610,7 @@ class PHPExcel_Style implements PHPExcel_IComparable
      */
     public function setConditionalStyles($pValue = null) {
 		if (is_array($pValue)) {
-			foreach (PHPExcel_Cell::extractAllCellReferencesInRange($this->getSelectedCells()) as $cellReference) {
-				$this->getActiveSheet()->setConditionalStyles($cellReference, $pValue);
-			}
+			$this->getActiveSheet()->setConditionalStyles($this->getSelectedCells(), $pValue);
 		}
 		return $this;
     }
diff --git a/changelog.txt b/changelog.txt
index 7c76474a..5d5e9016 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -52,6 +52,7 @@ Fixed in SVN:
                      These leading characters are most commonly associated with number, currency or accounting (or occasionally fraction) formats
 - Bugfix:   (MBaker) Workitem 14374 - BUG : Excel5 and setReadFilter ?
 - Bugfix:   (MBaker) Workitem 14425 - Wrong exception message while deleting column
+- General:  (MBaker) Applied patch 6609 - Removes a unnecessary loop through each cell when applying conditional formatting to a range.
 - General:  (MBaker) Applied patch 7169 - Removed spurious PHP end tags (?>)