diff --git a/lib/Doctrine/ORM/Internal/Hydration/SimpleObjectHydrator.php b/lib/Doctrine/ORM/Internal/Hydration/SimpleObjectHydrator.php
index 124b099c7..ea2664291 100644
--- a/lib/Doctrine/ORM/Internal/Hydration/SimpleObjectHydrator.php
+++ b/lib/Doctrine/ORM/Internal/Hydration/SimpleObjectHydrator.php
@@ -75,6 +75,11 @@ class SimpleObjectHydrator extends AbstractHydrator
         if ($this->class->inheritanceType !== ClassMetadata::INHERITANCE_TYPE_NONE) {
             $discrColumnName = $this->_platform->getSQLResultCasing($this->class->discriminatorColumn['name']);
 
+            // Find mapped discriminator column from the result set.
+            if ($metaMappingDiscrColumnName = array_search($discrColumnName, $this->_rsm->metaMappings)) {
+                $discrColumnName = $metaMappingDiscrColumnName;
+            }
+            
             if ( ! isset($sqlResult[$discrColumnName])) {
                 throw HydrationException::missingDiscriminatorColumn($entityName, $discrColumnName, key($this->_rsm->aliasMap));
             }
diff --git a/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC3170Test.php b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC3170Test.php
new file mode 100644
index 000000000..591b0fd71
--- /dev/null
+++ b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC3170Test.php
@@ -0,0 +1,110 @@
+<?php
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\ORM\AbstractQuery;
+use Doctrine\ORM\Internal\Hydration\HydrationException;
+
+/**
+ * @group DDC-2306
+ */
+class DDC3170Test extends \Doctrine\Tests\OrmFunctionalTestCase
+{
+    /**
+     * {@inheritDoc}
+     */
+    protected function setup()
+    {
+        parent::setup();
+
+        $this->_schemaTool->createSchema(
+            array(
+                $this->_em->getClassMetadata(__NAMESPACE__ . '\DDC3170AbstractEntityJoined'),
+                $this->_em->getClassMetadata(__NAMESPACE__ . '\DDC3170ProductJoined'),
+                $this->_em->getClassMetadata(__NAMESPACE__ . '\DDC3170AbstractEntitySingleTable'),
+                $this->_em->getClassMetadata(__NAMESPACE__ . '\DDC3170ProductSingleTable'),
+            )
+        );
+    }
+
+    /**
+     * Tests that the discriminator column is correctly read from the meta mappings when fetching a
+     * child from an inheritance mapped class.
+     *
+     * The simple object hydration maps the type field to a field alias like type2. This mapping needs
+     * to be considered when loading the discriminator column's value from the SQL result.
+     *
+     * {@see \Doctrine\ORM\Internal\Hydration\SimpleObjectHydrator::hydrateRowData()}
+     */
+    public function testIssue()
+    {
+        // $this->_em->getConnection()->getConfiguration()->setSQLLogger(new \Doctrine\DBAL\Logging\EchoSQLLogger);
+
+        $productJoined = new DDC3170ProductJoined();
+        $productSingleTable = new DDC3170ProductSingleTable();
+        $this->_em->persist($productJoined);
+        $this->_em->persist($productSingleTable);
+        $this->_em->flush();
+        $this->_em->clear();
+
+        try {
+            $this->_em->createQueryBuilder()
+                ->select('p')
+                ->from(__NAMESPACE__ . '\\DDC3170ProductJoined', 'p')
+                ->getQuery()
+                ->getResult(AbstractQuery::HYDRATE_SIMPLEOBJECT);
+        } catch (HydrationException $e) // Thrown by SimpleObjectHydrator
+        {
+            $this->fail('Failed correct mapping of discriminator column when using simple object hydration and class table inheritance');
+        }
+
+        try {
+            $this->_em->createQueryBuilder()
+                ->select('p')
+                ->from(__NAMESPACE__ . '\\DDC3170ProductSingleTable', 'p')
+                ->getQuery()
+                ->getResult(AbstractQuery::HYDRATE_SIMPLEOBJECT);
+        } catch (HydrationException $e) // Thrown by SimpleObjectHydrator
+        {
+            $this->fail('Failed correct mapping of discriminator column when using simple object hydration and single table inheritance');
+        }
+    }
+}
+
+/**
+ * @Entity
+ * @InheritanceType("JOINED")
+ * @DiscriminatorColumn(name="type", type="string")
+ * @DiscriminatorMap({"product" = "DDC3170ProductJoined"})
+ */
+abstract class DDC3170AbstractEntityJoined
+{
+    /** @Id @Column(type="integer") @GeneratedValue */
+    public $id;
+}
+
+/**
+ * @Entity
+ */
+class DDC3170ProductJoined extends DDC3170AbstractEntityJoined
+{
+}
+
+/**
+ * @Entity
+ * @InheritanceType("SINGLE_TABLE")
+ * @DiscriminatorColumn(name="type", type="string")
+ * @DiscriminatorMap({"product" = "DDC3170ProductSingleTable"})
+ */
+abstract class DDC3170AbstractEntitySingleTable
+{
+    /** @Id @Column(type="integer") @GeneratedValue */
+    public $id;
+}
+
+/**
+ * @Entity
+ */
+class DDC3170ProductSingleTable extends DDC3170AbstractEntitySingleTable
+{
+}