diff --git a/vllm_omni/config/omni_config.py b/vllm_omni/config/omni_config.py
index 0ddcb2b37..641997468 100644
--- a/vllm_omni/config/omni_config.py
+++ b/vllm_omni/config/omni_config.py
@@ -568,6 +568,7 @@ class _DiffusionConfigProjection:
     pin_cpu_memory: bool = True
     diffusion_compile_granularity: Literal["regional", "full"] = "regional"
     diffusion_compile_dynamic: bool = Field(default=True, strict=True)
+    fa_deterministic: bool = False
     vae_use_slicing: bool = False
     vae_use_tiling: bool = False
     mask_strategy_file_path: str | None = None