diff --git a/tests/src/Kernel/GridStackFormatterTest.php b/tests/src/Kernel/GridStackFormatterTest.php
index 51cc7bc..ce5ddd5 100644
--- a/tests/src/Kernel/GridStackFormatterTest.php
+++ b/tests/src/Kernel/GridStackFormatterTest.php
@@ -139,7 +139,7 @@ class GridStackFormatterTest extends BlazyKernelTestBase {
    * @return array
    *   An array of tested data.
    */
-  public function providerTestBuildSettings() {
+  public static function providerTestBuildSettings() {
     $data[] = [
       [],
       FALSE,
diff --git a/tests/src/Kernel/GridStackManagerTest.php b/tests/src/Kernel/GridStackManagerTest.php
index 811f212..3deda5b 100644
--- a/tests/src/Kernel/GridStackManagerTest.php
+++ b/tests/src/Kernel/GridStackManagerTest.php
@@ -143,7 +143,7 @@ class GridStackManagerTest extends BlazyKernelTestBase {
    * @return array
    *   An array of tested data.
    */
-  public function providerTestGridStackBuild() {
+  public static function providerTestGridStackBuild() {
     $data[] = [
       FALSE,
       [],