diff --git a/langtest/transform/image/robustness.py b/langtest/transform/image/robustness.py
index 507a4bda1..dc7cb5819 100644
--- a/langtest/transform/image/robustness.py
+++ b/langtest/transform/image/robustness.py
@@ -449,7 +449,10 @@ def transform(
             draw = ImageDraw.Draw(sample.perturbed_image)
             font = ImageFont.load_default()
             draw.text(
-                position, text, font=font, fill=font_color,
+                position,
+                text,
+                font=font,
+                fill=font_color,
             )
 
         return sample_list