diff --git a/src/llamafactory/model/utils/visual.py b/src/llamafactory/model/utils/visual.py
index e3b81bd1..c8260b7f 100644
--- a/src/llamafactory/model/utils/visual.py
+++ b/src/llamafactory/model/utils/visual.py
@@ -69,7 +69,7 @@ def autocast_projector_dtype(
     ) -> "torch.Tensor":
         return output.to(model_args.compute_dtype)
 
-    if hasattr(model, mm_projector_name) and getattr(model.config, "quantization_method", None):
+    if hasattr(model, mm_projector_name) and getattr(model, "quantization_method", None):
         logger.info("Casting multimodal projector outputs in {}.".format(model_args.compute_dtype))
         mm_projector: "torch.nn.Module" = getattr(model, mm_projector_name)
         mm_projector.register_forward_hook(_mm_projector_forward_post_hook)