diff --git a/api/core/tools/provider/builtin/comfyui/tools/comfyui_stable_diffusion.py b/api/core/tools/provider/builtin/comfyui/tools/comfyui_stable_diffusion.py
index 81fc8cc985..eaa4b0d027 100644
--- a/api/core/tools/provider/builtin/comfyui/tools/comfyui_stable_diffusion.py
+++ b/api/core/tools/provider/builtin/comfyui/tools/comfyui_stable_diffusion.py
@@ -333,7 +333,7 @@ class ComfyuiStableDiffusionTool(BuiltinTool):
                         break
 
             return self.create_blob_message(
-                blob=image, meta={"mime_type": "image/png"}, save_as=self.VARIABLE_KEY.IMAGE.value
+                blob=image, meta={"mime_type": "image/png"}, save_as=self.VariableKey.IMAGE.value
             )
 
         except Exception as e: