diff --git a/tests/forms/gridfield/GridFieldDetailFormTest.php b/tests/forms/gridfield/GridFieldDetailFormTest.php
index ca3e87dbc..055badcda 100644
--- a/tests/forms/gridfield/GridFieldDetailFormTest.php
+++ b/tests/forms/gridfield/GridFieldDetailFormTest.php
@@ -242,7 +242,7 @@ class GridFieldDetailFormTest_Person extends DataObject implements TestOnly {
 		)
 	);
 
-	private static $default_sort = 'FirstName';
+	private static $default_sort = '"FirstName"';
 
 	public function getCMSFields() {
 		$fields = parent::getCMSFields();
@@ -266,7 +266,7 @@ class GridFieldDetailFormTest_PeopleGroup extends DataObject implements TestOnly
 		'People' => 'GridFieldDetailFormTest_Person'
 	);
 
-	private static $default_sort = 'Name';
+	private static $default_sort = '"Name"';
 
 	public function getCMSFields() {
 		$fields = parent::getCMSFields();
@@ -290,7 +290,7 @@ class GridFieldDetailFormTest_Category extends DataObject implements TestOnly {
 		'People' => 'GridFieldDetailFormTest_Person'
 	);
 
-	private static $default_sort = 'Name';
+	private static $default_sort = '"Name"';
 
 	public function getCMSFields() {
 		$fields = parent::getCMSFields();
diff --git a/tests/model/DataObjectTest.php b/tests/model/DataObjectTest.php
index c651e64e9..aa8a45782 100644
--- a/tests/model/DataObjectTest.php
+++ b/tests/model/DataObjectTest.php
@@ -1161,7 +1161,7 @@ class DataObjectTest_Team extends DataObject implements TestOnly {
 		)
 	);
 
-	private static $default_sort = "Title";
+	private static $default_sort = '"Title"';
 
 	public function MyTitle() {
 		return 'Team ' . $this->Title;