diff --git a/examples/research_projects/diffusion_dpo/train_diffusion_dpo_sdxl.py b/examples/research_projects/diffusion_dpo/train_diffusion_dpo_sdxl.py
index 3fd3fc11ad19..f175ff94a864 100644
--- a/examples/research_projects/diffusion_dpo/train_diffusion_dpo_sdxl.py
+++ b/examples/research_projects/diffusion_dpo/train_diffusion_dpo_sdxl.py
@@ -741,7 +741,7 @@ def preprocess_train(examples):
             combined_im = train_resize(combined_im)
 
             # Flipping.
-            if not args.no_flip and random.random() < 0.5:
+            if not args.no_hflip and random.random() < 0.5:
                 combined_im = train_flip(combined_im)
 
             # Cropping.