diff --git a/tests/core/ConfigTest.php b/tests/core/ConfigTest.php
index 07b3490c2..e0abcaa8a 100644
--- a/tests/core/ConfigTest.php
+++ b/tests/core/ConfigTest.php
@@ -189,8 +189,7 @@ class ConfigTest extends SapphireTest {
 		// But it won't affect subclasses - this is *uninherited* static
 		$this->assertNotContains('test_2b',
 			Config::inst()->get('ConfigStaticTest_Third', 'first', Config::UNINHERITED));
-		$this->assertNotContains('test_2b',
-			Config::inst()->get('ConfigStaticTest_Fourth', 'first', Config::UNINHERITED));
+		$this->assertNull(Config::inst()->get('ConfigStaticTest_Fourth', 'first', Config::UNINHERITED));
 
 		// Subclasses that don't have the static explicitly defined should allow definition, also
 		// This also checks that set can be called after the first uninherited get()