diff --git a/tests/features_test.features.inc b/tests/features_test.features.inc
index 623c08f..d4d30f2 100644
--- a/tests/features_test.features.inc
+++ b/tests/features_test.features.inc
@@ -24,6 +24,7 @@ function features_test_image_default_styles() {
         'label' => 'Scale',
         'help' => 'Scaling will maintain the aspect-ratio of the original image. If only a single dimension is specified, the other dimension will be calculated.',
         'effect callback' => 'image_scale_effect',
+        'dimensions callback' => 'image_scale_dimensions',
         'form callback' => 'image_scale_form',
         'summary theme' => 'image_scale_summary',
         'module' => 'image',