diff --git a/tests/php/Forms/CheckboxField_ReadonlyTest.php b/tests/php/Forms/CheckboxFieldReadonlyTest.php
similarity index 88%
rename from tests/php/Forms/CheckboxField_ReadonlyTest.php
rename to tests/php/Forms/CheckboxFieldReadonlyTest.php
index 4996deda8..e82156325 100644
--- a/tests/php/Forms/CheckboxField_ReadonlyTest.php
+++ b/tests/php/Forms/CheckboxFieldReadonlyTest.php
@@ -5,7 +5,7 @@ namespace SilverStripe\Forms\Tests;
 use SilverStripe\Dev\SapphireTest;
 use SilverStripe\Forms\CheckboxField_Readonly;
 
-class CheckboxField_ReadonlyTest extends SapphireTest
+class CheckboxFieldReadonlyTest extends SapphireTest
 {
     public function testPerformReadonlyTransformation()
     {