diff --git a/lib/Doctrine/ORM/Query/SqlWalker.php b/lib/Doctrine/ORM/Query/SqlWalker.php
index 082f95f50..c3fb467de 100644
--- a/lib/Doctrine/ORM/Query/SqlWalker.php
+++ b/lib/Doctrine/ORM/Query/SqlWalker.php
@@ -21,6 +21,7 @@ namespace Doctrine\ORM\Query;
 
 use Doctrine\DBAL\LockMode;
 use Doctrine\DBAL\Types\Type;
+use Doctrine\DBAL\Platforms\SQLServerPlatform;
 use Doctrine\ORM\Mapping\ClassMetadata;
 use Doctrine\ORM\Query;
 use Doctrine\ORM\Query\QueryException;
@@ -1624,7 +1625,11 @@ class SqlWalker implements TreeWalker
 
         // ResultVariable
         if (isset($this->queryComponents[$groupByItem]['resultVariable'])) {
-            return $this->walkResultVariable($groupByItem);
+            if ($this->platform instanceof SQLServerPlatform) {
+                return $this->walkPathExpression($this->queryComponents[$groupByItem]['resultVariable']->pathExpression);
+            } else {
+                return $this->walkResultVariable($groupByItem);
+            }
         }
 
         // IdentificationVariable