diff --git a/lib/Cake/Model/Datasource/Database/Query.php b/lib/Cake/Model/Datasource/Database/Query.php
index 2cbe54baf8d..43a1b4748e7 100644
--- a/lib/Cake/Model/Datasource/Database/Query.php
+++ b/lib/Cake/Model/Datasource/Database/Query.php
@@ -89,7 +89,7 @@ public function sql() {
 			if (!count($parts)) {
 				return;
 			}
-			if ($parts instanceof QueryExpression || $parts instanceof self) {
+			if ($parts instanceof QueryExpression) {
 				$parts = [$parts->sql()];
 			}
 			if (isset($this->_templates[$name])) {
@@ -433,7 +433,7 @@ protected function _bindParams($statement) {
  * @return string
  **/
 	public function __toString() {
-		return $this->sql();
+		return sprintf('(%s)', $this->sql());
 	}
 
 }
diff --git a/lib/Cake/Test/TestCase/Model/Datasource/Database/QueryTest.php b/lib/Cake/Test/TestCase/Model/Datasource/Database/QueryTest.php
index 3810d3f5b6a..c0c601e5ef8 100644
--- a/lib/Cake/Test/TestCase/Model/Datasource/Database/QueryTest.php
+++ b/lib/Cake/Test/TestCase/Model/Datasource/Database/QueryTest.php
@@ -1265,4 +1265,27 @@ public function testSelectOffset() {
 		$this->assertEquals(['id' => 3], $result->fetch('assoc'));
 	}
 
+	public function testSuqueryInSelect() {
+		$this->_insertDateRecords();
+		$this->_insertTwoRecords();
+
+		$query = new Query($this->connection);
+		$subquery = (new Query($this->connection))
+			->select('name')
+			->from(['b' => 'authors'])
+			->where(['b.id = a.id']);
+		$result = $query
+			->select(['id', 'name' => $subquery])
+			->from(['a' => 'dates'])->execute();
+
+		$expected = [
+			['id' => 1, 'name' => 'Chuck Norris'],
+			['id' => 2, 'name' => 'Bruce Lee'],
+			['id' => 3, 'name' => null]
+		];
+		$this->assertEquals($expected, $result->fetchAll('assoc'));
+
+
+	}
+
 }