diff --git a/Classes/PHPExcel/Reader/Abstract.php b/Classes/PHPExcel/Reader/Abstract.php
index e0f4c0dc..1a6b422f 100644
--- a/Classes/PHPExcel/Reader/Abstract.php
+++ b/Classes/PHPExcel/Reader/Abstract.php
@@ -145,7 +145,10 @@ abstract class PHPExcel_Reader_Abstract implements PHPExcel_Reader_IReader
 	 */
 	public function setLoadSheetsOnly($value = NULL)
 	{
-		$this->_loadSheetsOnly = is_array($value) ?
+        if ($value === NULL)
+            return $this->setLoadAllSheets();
+
+        $this->_loadSheetsOnly = is_array($value) ?
 			$value : array($value);
 		return $this;
 	}
diff --git a/changelog.txt b/changelog.txt
index af74b496..4d6b41d1 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -27,6 +27,7 @@ Planned for v1.8.1
 - Bugfix:   (sarciszewski)    Work Item GH-329  - Avoid potential divide by zero in basedrawing
 - Bugfix:   (ymaerschalck)    Work Item GH-405  - XML External Entity (XXE) Processing, different behaviour between simplexml_load_string() and simplexml_load_file().
 - Bugfix:   (MBaker)                            - Fix to ensure that current cell is maintained when executing formula calculations
+- Bugfix:   (MBaker)          Work Item GH-350  - Keep/set the value on Reader _loadSheetsOnly as NULL, courtesy of Restless-ET 
 - General:  (MBaker)                            - Small performance improvement for autosize columns
 - General:  (frost-nzcr4)     Work Item GH-379  - Change the getter/setter for zeroHeight to camel case
 - Feature:  (WiktrzGE)        Work Item GH-404  - Methods to manage most of the existing options for Chart Axis, Major Grid-lines and Minor Grid-lines