diff --git a/tests/Doctrine/Tests/DBAL/Functional/Schema/SchemaManagerFunctionalTestCase.php b/tests/Doctrine/Tests/DBAL/Functional/Schema/SchemaManagerFunctionalTestCase.php
index 6c2679baebb..c9826f14243 100644
--- a/tests/Doctrine/Tests/DBAL/Functional/Schema/SchemaManagerFunctionalTestCase.php
+++ b/tests/Doctrine/Tests/DBAL/Functional/Schema/SchemaManagerFunctionalTestCase.php
@@ -46,7 +46,7 @@
 use function strtolower;
 use function substr;
 
-class SchemaManagerFunctionalTestCase extends DbalFunctionalTestCase
+abstract class SchemaManagerFunctionalTestCase extends DbalFunctionalTestCase
 {
     /** @var AbstractSchemaManager */
     protected $schemaManager;
diff --git a/tests/Doctrine/Tests/DbalFunctionalTestCase.php b/tests/Doctrine/Tests/DbalFunctionalTestCase.php
index 149db8bf998..1e37c3060e8 100644
--- a/tests/Doctrine/Tests/DbalFunctionalTestCase.php
+++ b/tests/Doctrine/Tests/DbalFunctionalTestCase.php
@@ -18,7 +18,7 @@
 use function strpos;
 use function var_export;
 
-class DbalFunctionalTestCase extends DbalTestCase
+abstract class DbalFunctionalTestCase extends DbalTestCase
 {
     /**
      * Shared connection when a TestCase is run alone (outside of it's functional suite)
diff --git a/tests/Doctrine/Tests/DbalPerformanceTestCase.php b/tests/Doctrine/Tests/DbalPerformanceTestCase.php
index 0001431454a..f9bb40df38c 100644
--- a/tests/Doctrine/Tests/DbalPerformanceTestCase.php
+++ b/tests/Doctrine/Tests/DbalPerformanceTestCase.php
@@ -11,7 +11,7 @@
  * and stopTiming at the end of all tests. Tests that do not start or stop
  * timing will fail.
  */
-class DbalPerformanceTestCase extends DbalFunctionalTestCase
+abstract class DbalPerformanceTestCase extends DbalFunctionalTestCase
 {
     /**
      * time the test started