diff --git a/src/diffusers/pipelines/wan/pipeline_wan_animate.py b/src/diffusers/pipelines/wan/pipeline_wan_animate.py
index 9340609cb9..5806032c01 100644
--- a/src/diffusers/pipelines/wan/pipeline_wan_animate.py
+++ b/src/diffusers/pipelines/wan/pipeline_wan_animate.py
@@ -785,7 +785,7 @@ class WanAnimatePipeline(DiffusionPipeline, WanLoraLoaderMixin):
         output_type: str | None = "np",
         return_dict: bool = True,
         attention_kwargs: dict[str, Any] | None = None,
-        callback_on_step_end: Callable[[int, int, None], PipelineCallback, MultiPipelineCallbacks] | None = None,
+        callback_on_step_end: Callable[[int, int, None], PipelineCallback | MultiPipelineCallbacks] | None = None,
         callback_on_step_end_tensor_inputs: list[str] = ["latents"],
         max_sequence_length: int = 512,
     ):