diff --git a/comfy_extras/nodes_model_merging.py b/comfy_extras/nodes_model_merging.py
index b0d149c..136f9a9 100644
--- a/comfy_extras/nodes_model_merging.py
+++ b/comfy_extras/nodes_model_merging.py
@@ -264,6 +264,7 @@ class CLIPSave:
 
         metadata = {}
         if not args.disable_metadata:
+            metadata["format"] = "pt"
             metadata["prompt"] = prompt_info
             if extra_pnginfo is not None:
                 for x in extra_pnginfo: