diff --git a/runtime/lib/formatter/PropelFormatter.php b/runtime/lib/formatter/PropelFormatter.php
index 9990a295c..0b452f4eb 100644
--- a/runtime/lib/formatter/PropelFormatter.php
+++ b/runtime/lib/formatter/PropelFormatter.php
@@ -169,12 +169,14 @@ protected function isWithOneToMany()
 	 */
 	protected function getWorkerObject($col, $class)
 	{
-		if(isset($this->currentObjects[$col])) {
-			$this->currentObjects[$col]->clear();
+		$key = $col . '_' . $class;
+
+		if (isset($this->currentObjects[$key])) {
+			$this->currentObjects[$key]->clear();
 		} else {
-			$this->currentObjects[$col] = new $class();
+			$this->currentObjects[$key] = new $class();
 		}
-		return $this->currentObjects[$col];
+		return $this->currentObjects[$key];
 	}
 
 	/**
diff --git a/test/testsuite/runtime/formatter/PropelFormatterTest.php b/test/testsuite/runtime/formatter/PropelFormatterTest.php
new file mode 100644
index 000000000..ad24819ea
--- /dev/null
+++ b/test/testsuite/runtime/formatter/PropelFormatterTest.php
@@ -0,0 +1,65 @@
+<?php
+
+/**
+ * This file is part of the Propel package.
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @license    MIT License
+ */
+
+require_once dirname(__FILE__) . '/../../../tools/helpers/bookstore/BookstoreEmptyTestBase.php';
+
+/**
+ * Test class for PropelObjectFormatter.
+ *
+ * @author     Francois Zaninotto
+ * @version    $Id$
+ * @package    runtime.formatter
+ */
+class PropelFormatterTest extends BookstoreEmptyTestBase
+{
+	protected function setUp()
+	{
+		parent::setUp();
+		BookstoreDataPopulator::populate();
+	}
+
+	public function testGetWorkerObjectReturnsRightClass()
+	{
+		$formatter = $this->getMockForAbstractClass('PropelFormatter');
+
+		$method = new ReflectionMethod('PropelFormatter', 'getWorkerObject');
+		$method->setAccessible(true);
+
+		$classNames = array(
+			'Bookstore',
+			'BookReader',
+			'BookClubList',
+		);
+
+		$col = 0;
+		foreach ($classNames as $className) {
+			// getWorkerObject() should always return an instance of the requested class, regardless of the value of $col
+			$result = $method->invoke($formatter, $col, $className);
+
+			$this->assertEquals($className, get_class($result), 'getWorkerObject did not return an instance of the requested class');
+		}
+	}
+
+	public function testGetWorkerObjectCachedInstance()
+	{
+		$formatter = $this->getMockForAbstractClass('PropelFormatter');
+
+		$method = new ReflectionMethod('PropelFormatter', 'getWorkerObject');
+		$method->setAccessible(true);
+
+		$className = 'Bookstore';
+		$col = 0;
+
+		$result1 = $method->invoke($formatter, $col, $className);
+		$result2 = $method->invoke($formatter, $col, $className);
+
+		$this->assertEquals(spl_object_hash($result1), spl_object_hash($result2), 'getWorkerObject should return a cached instance of a class at the same col index');
+	}
+}
diff --git a/test/testsuite/runtime/formatter/PropelOnDemandFormatterTest.php b/test/testsuite/runtime/formatter/PropelOnDemandFormatterTest.php
index 08c8a75cf..4fb03be8d 100644
--- a/test/testsuite/runtime/formatter/PropelOnDemandFormatterTest.php
+++ b/test/testsuite/runtime/formatter/PropelOnDemandFormatterTest.php
@@ -148,4 +148,25 @@ public function testFormatOneManyResults()
 		$this->assertTrue($book instanceof Book, 'PropelOnDemandFormatter::formatOne() returns a model object');
 	}
 
+	public function testFormatSingleTableInheritanceManyResults()
+	{
+		$con = Propel::getConnection(BookPeer::DATABASE_NAME);
+		BookstoreDataPopulator::populate($con);
+
+		$stmt = $con->query('SELECT * FROM bookstore_employee');
+		$formatter = new PropelOnDemandFormatter();
+		$formatter->init(new ModelCriteria('bookstore', 'BookstoreEmployee'));
+
+		$employees = $formatter->format($stmt);
+
+		foreach ($employees as $employee) {
+			$row = array();
+			$row[1] = $employee->getClassKey();
+
+			$omClass = BookstoreEmployeePeer::getOMClass($row, 0, false);
+			$actualClass = get_class($employee);
+
+			$this->assertEquals($omClass, $actualClass, 'PropelOnDemandFormatter::format() should handle single table inheritance');
+		}
+	}
 }
diff --git a/test/tools/helpers/bookstore/BookstoreDataPopulator.php b/test/tools/helpers/bookstore/BookstoreDataPopulator.php
index d21eb9a59..0b7d34ada 100644
--- a/test/tools/helpers/bookstore/BookstoreDataPopulator.php
+++ b/test/tools/helpers/bookstore/BookstoreDataPopulator.php
@@ -167,6 +167,11 @@ public static function populate($con = null)
 		$bemp2->setSupervisor($bemp1);
 		$bemp2->save($con);
 
+		$bemp3 = new BookstoreCashier();
+		$bemp3->setName("Tim");
+		$bemp3->setJobTitle("Cashier");
+		$bemp3->save($con);
+
 		$role = new AcctAccessRole();
 		$role->setName("Admin");