diff --git a/comfy/model_base.py b/comfy/model_base.py
index b0b9cde7d..cadeddf6b 100644
--- a/comfy/model_base.py
+++ b/comfy/model_base.py
@@ -834,6 +834,7 @@ class PixArt(BaseModel):
 class Flux(BaseModel):
     def __init__(self, model_config, model_type=ModelType.FLUX, device=None, unet_model=comfy.ldm.flux.model.Flux):
         super().__init__(model_config, model_type, device=device, unet_model=unet_model)
+        self.diffusion_model.eval().requires_grad_(False)
         self.memory_usage_factor_conds = ("ref_latents",)
 
     def concat_cond(self, **kwargs):