diff --git a/Classes/PHPExcel/Writer/Excel2007/StringTable.php b/Classes/PHPExcel/Writer/Excel2007/StringTable.php
index 2021bc1..2f2ff03 100644
--- a/Classes/PHPExcel/Writer/Excel2007/StringTable.php
+++ b/Classes/PHPExcel/Writer/Excel2007/StringTable.php
@@ -59,24 +59,22 @@ class PHPExcel_Writer_Excel2007_StringTable extends PHPExcel_Writer_Excel2007_Wr
 			// Fill index array
 			$aFlippedStringTable = $this->flipStringTable($aStringTable);
 
-	        // Loop through cells
-	        foreach ($pSheet->getCellCollection() as $cellID) {
+			// Loop through cells
+			foreach ($pSheet->getCellCollection() as $cellID) {
 				$cell = $pSheet->getCell($cellID);
-	        	if (!is_object($cell->getValue()) &&
-	        		!isset($aFlippedStringTable[$cell->getValue()]) &&
-	        		!is_null($cell->getValue()) &&
-	        		$cell->getValue() !== '' &&
-	        		($cell->getDataType() == PHPExcel_Cell_DataType::TYPE_STRING || $cell->getDataType() == PHPExcel_Cell_DataType::TYPE_STRING2 || $cell->getDataType() == PHPExcel_Cell_DataType::TYPE_NULL)
-	        	) {
-	        			$aStringTable[] = $cell->getValue();
-						$aFlippedStringTable[$cell->getValue()] = 1;
-
-	        	} else if ($cell->getValue() instanceof PHPExcel_RichText &&
-	        			   !isset($aFlippedStringTable[$cell->getValue()->getHashCode()]) &&
-	        			   !is_null($cell->getValue())
-	        	) {
-	        		$aStringTable[] = $cell->getValue();
-					$aFlippedStringTable[$cell->getValue()->getHashCode()] = 1;
+				$cellValue = $cell->getValue();
+				if (!is_object($cellValue) &&
+					!is_null($cellValue) &&
+					$cellValue !== '' &&
+					!isset($aFlippedStringTable[$cellValue]) &&
+					($cell->getDataType() == PHPExcel_Cell_DataType::TYPE_STRING || $cell->getDataType() == PHPExcel_Cell_DataType::TYPE_STRING2 || $cell->getDataType() == PHPExcel_Cell_DataType::TYPE_NULL)) {
+						$aStringTable[] = $cellValue;
+						$aFlippedStringTable[$cellValue] = 1;
+				} elseif ($cellValue instanceof PHPExcel_RichText &&
+						  !is_null($cellValue) &&
+						  !isset($aFlippedStringTable[$cellValue->getHashCode()])) {
+								$aStringTable[] = $cellValue;
+								$aFlippedStringTable[$cellValue->getHashCode()] = 1;
 	        	}
 	        }
 
diff --git a/changelog.txt b/changelog.txt
index c293a04..8bbc760 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -38,7 +38,8 @@ Fixed in SVN:
 - Bugfix:	(MBaker) Work item 14999 - PHPExcel Excel2007 Reader colour problems with solidfill
 - Bugfix:	(MBaker) Work item 13215 - Formatting get lost and edit a template XLSX file
 - Bugfix:	(MBaker) Work item 14029 - Excel 2007 Reader /writer lost fontcolor
-- Bugfix:	(MBaker) Work item 13374 - file that makes cells go black 
+- Bugfix:	(MBaker) Work item 13374 - file that makes cells go black
+- General:  (MBaker) Improved performance (speed), for building the Shared Strings table in the Excel2007 Writer.