diff --git a/api/onnx_web/serve.py b/api/onnx_web/serve.py
index 867ec307..4ea0dfcd 100644
--- a/api/onnx_web/serve.py
+++ b/api/onnx_web/serve.py
@@ -218,15 +218,18 @@ def load_models(context: ServerContext):
         path.join(context.model_path, 'diffusion-*'))]
     diffusion_models.extend([
         get_model_name(f) for f in glob(path.join(context.model_path, 'stable-diffusion-*'))])
-    diffusion_models = list(set(diffusion_models)).sort()
+    diffusion_models = list(set(diffusion_models))
+    diffusion_models.sort()
 
     correction_models = [
         get_model_name(f) for f in glob(path.join(context.model_path, 'correction-*'))]
-    correction_models = list(set(correction_models)).sort()
+    correction_models = list(set(correction_models))
+    correction_models.sort()
 
     upscaling_models = [
         get_model_name(f) for f in glob(path.join(context.model_path, 'upscaling-*'))]
-    upscaling_models = list(set(upscaling_models)).sort()
+    upscaling_models = list(set(upscaling_models))
+    upscaling_models.sort()
 
 
 def load_params(context: ServerContext):