diff --git a/tests/dbal/migration/dummy.php b/tests/dbal/migration/dummy.php
index e542493f9f..0ac6e733a1 100644
--- a/tests/dbal/migration/dummy.php
+++ b/tests/dbal/migration/dummy.php
@@ -9,7 +9,7 @@
 
 class phpbb_dbal_migration_dummy extends phpbb_db_migration
 {
-	function depends_on()
+	static public function depends_on()
 	{
 		return array('installed_migration');
 	}
diff --git a/tests/dbal/migration/fail.php b/tests/dbal/migration/fail.php
index 8b5c521e09..f88d8169f5 100644
--- a/tests/dbal/migration/fail.php
+++ b/tests/dbal/migration/fail.php
@@ -9,11 +9,6 @@
 
 class phpbb_dbal_migration_fail extends phpbb_db_migration
 {
-	function depends_on()
-	{
-		return array();
-	}
-
 	function update_schema()
 	{
 		return array(
diff --git a/tests/dbal/migration/if.php b/tests/dbal/migration/if.php
index aa9a5dab87..83fe21bd21 100644
--- a/tests/dbal/migration/if.php
+++ b/tests/dbal/migration/if.php
@@ -9,11 +9,6 @@
 
 class phpbb_dbal_migration_if extends phpbb_db_migration
 {
-	function depends_on()
-	{
-		return array();
-	}
-
 	function update_schema()
 	{
 		return array();
diff --git a/tests/dbal/migration/recall.php b/tests/dbal/migration/recall.php
index 18d8b4a6d2..6c2f04bf08 100644
--- a/tests/dbal/migration/recall.php
+++ b/tests/dbal/migration/recall.php
@@ -9,11 +9,6 @@
 
 class phpbb_dbal_migration_recall extends phpbb_db_migration
 {
-	function depends_on()
-	{
-		return array();
-	}
-
 	function update_schema()
 	{
 		return array();
diff --git a/tests/dbal/migration/revert.php b/tests/dbal/migration/revert.php
index 2bb23e31c2..ac01987cd4 100644
--- a/tests/dbal/migration/revert.php
+++ b/tests/dbal/migration/revert.php
@@ -9,11 +9,6 @@
 
 class phpbb_dbal_migration_revert extends phpbb_db_migration
 {
-	function depends_on()
-	{
-		return array();
-	}
-
 	function update_schema()
 	{
 		return array(
diff --git a/tests/dbal/migration/revert_with_dependency.php b/tests/dbal/migration/revert_with_dependency.php
index f6820dbf3f..ca2c070e8c 100644
--- a/tests/dbal/migration/revert_with_dependency.php
+++ b/tests/dbal/migration/revert_with_dependency.php
@@ -9,7 +9,7 @@
 
 class phpbb_dbal_migration_revert_with_dependency extends phpbb_db_migration
 {
-	function depends_on()
+	static public function depends_on()
 	{
 		return array('phpbb_dbal_migration_revert');
 	}
diff --git a/tests/dbal/migration/unfulfillable.php b/tests/dbal/migration/unfulfillable.php
index 84136ffe6d..6d375e6880 100644
--- a/tests/dbal/migration/unfulfillable.php
+++ b/tests/dbal/migration/unfulfillable.php
@@ -9,7 +9,7 @@
 
 class phpbb_dbal_migration_unfulfillable extends phpbb_db_migration
 {
-	function depends_on()
+	static public function depends_on()
 	{
 		return array('installed_migration', 'phpbb_dbal_migration_dummy', 'non_existant_migration');
 	}