diff --git a/tests/src/Unit/AdvDefTest.php b/tests/src/Unit/AdvDefTest.php
index 1ab83965162ec3d259cda18c43c48b11c11ec908..240bc3712c4e0c70c8e3be0418add699017feeee 100644
--- a/tests/src/Unit/AdvDefTest.php
+++ b/tests/src/Unit/AdvDefTest.php
@@ -61,7 +61,7 @@ class AdvDefTest extends BinaryTestCase {
 
     $advdef = new AdvDef(['data' => $config], 'advdef', [], $loggerMock, $imageFactoryMock, $fileSystemMock, $shellOperationsMock);
 
-    $imagePNGMock = $this->createtMock('\Drupal\Core\Image\ImageInterface');
+    $imagePNGMock = $this->createMock('\Drupal\Core\Image\ImageInterface');
     $imagePNGMock->method('getMimeType')->willReturn('image/png');
     $imageFactoryMock->method('get')->willReturn($imagePNGMock);