diff --git a/invokeai/backend/stable_diffusion/extensions/controlnet.py b/invokeai/backend/stable_diffusion/extensions/controlnet.py
index e74d183c2c..0506a7f1a3 100644
--- a/invokeai/backend/stable_diffusion/extensions/controlnet.py
+++ b/invokeai/backend/stable_diffusion/extensions/controlnet.py
@@ -31,25 +31,25 @@ class ControlNetExt(ExtensionBase):
         resize_mode: str,
     ):
         super().__init__()
-        self.model = model
-        self.image = image
-        self.weight = weight
-        self.begin_step_percent = begin_step_percent
-        self.end_step_percent = end_step_percent
-        self.control_mode = control_mode
-        self.resize_mode = resize_mode
+        self._model = model
+        self._image = image
+        self._weight = weight
+        self._begin_step_percent = begin_step_percent
+        self._end_step_percent = end_step_percent
+        self._control_mode = control_mode
+        self._resize_mode = resize_mode
 
-        self.image_tensor: Optional[torch.Tensor] = None
+        self._image_tensor: Optional[torch.Tensor] = None
 
     @contextmanager
     def patch_extension(self, ctx: DenoiseContext):
         try:
-            original_processors = self.model.attn_processors
-            self.model.set_attn_processor(ctx.inputs.attention_processor_cls())
+            original_processors = self._model.attn_processors
+            self._model.set_attn_processor(ctx.inputs.attention_processor_cls())
 
             yield None
         finally:
-            self.model.set_attn_processor(original_processors)
+            self._model.set_attn_processor(original_processors)
 
     @callback(ExtensionCallbackType.PRE_DENOISE_LOOP)
     def resize_image(self, ctx: DenoiseContext):
@@ -57,8 +57,8 @@ class ControlNetExt(ExtensionBase):
         image_height = latent_height * LATENT_SCALE_FACTOR
         image_width = latent_width * LATENT_SCALE_FACTOR
 
-        self.image_tensor = prepare_control_image(
-            image=self.image,
+        self._image_tensor = prepare_control_image(
+            image=self._image,
             do_classifier_free_guidance=False,
             width=image_width,
             height=image_height,
@@ -66,22 +66,22 @@ class ControlNetExt(ExtensionBase):
             # num_images_per_prompt=num_images_per_prompt,
             device=ctx.latents.device,
             dtype=ctx.latents.dtype,
-            control_mode=self.control_mode,
-            resize_mode=self.resize_mode,
+            control_mode=self._control_mode,
+            resize_mode=self._resize_mode,
         )
 
     @callback(ExtensionCallbackType.PRE_UNET)
     def pre_unet_step(self, ctx: DenoiseContext):
         # skip if model not active in current step
         total_steps = len(ctx.inputs.timesteps)
-        first_step = math.floor(self.begin_step_percent * total_steps)
-        last_step = math.ceil(self.end_step_percent * total_steps)
+        first_step = math.floor(self._begin_step_percent * total_steps)
+        last_step = math.ceil(self._end_step_percent * total_steps)
         if ctx.step_index < first_step or ctx.step_index > last_step:
             return
 
         # convert mode to internal flags
-        soft_injection = self.control_mode in ["more_prompt", "more_control"]
-        cfg_injection = self.control_mode in ["more_control", "unbalanced"]
+        soft_injection = self._control_mode in ["more_prompt", "more_control"]
+        cfg_injection = self._control_mode in ["more_control", "unbalanced"]
 
         # no negative conditioning in cfg_injection mode
         if cfg_injection:
@@ -117,7 +117,7 @@ class ControlNetExt(ExtensionBase):
         total_steps = len(ctx.inputs.timesteps)
 
         model_input = ctx.latent_model_input
-        image_tensor = self.image_tensor
+        image_tensor = self._image_tensor
         if conditioning_mode == ConditioningMode.Both:
             model_input = torch.cat([model_input] * 2)
             image_tensor = torch.cat([image_tensor] * 2)
@@ -134,7 +134,7 @@ class ControlNetExt(ExtensionBase):
         ctx.inputs.conditioning_data.to_unet_kwargs(cn_unet_kwargs, conditioning_mode=conditioning_mode)
 
         # get static weight, or weight corresponding to current step
-        weight = self.weight
+        weight = self._weight
         if isinstance(weight, list):
             weight = weight[ctx.step_index]
 
@@ -144,7 +144,7 @@ class ControlNetExt(ExtensionBase):
         tmp_kwargs.pop("down_intrablock_additional_residuals", None)
 
         # controlnet(s) inference
-        down_samples, mid_sample = self.model(
+        down_samples, mid_sample = self._model(
             controlnet_cond=image_tensor,
             conditioning_scale=weight,  # controlnet specific, NOT the guidance scale
             guess_mode=soft_injection,  # this is still called guess_mode in diffusers ControlNetModel