diff --git a/convert_hf_to_gguf.py b/convert_hf_to_gguf.py
index 2849163123..bc68be066c 100755
--- a/convert_hf_to_gguf.py
+++ b/convert_hf_to_gguf.py
@@ -416,7 +416,7 @@ class ModelBase:
                     block_size = weight_config.get("block_structure", None)
                     strategy = weight_config.get("strategy")
                     assert strategy == "channel" or strategy == "block"
-                    assert weight_config.get("group_size") == None  # didn't find a model using this yet
+                    assert weight_config.get("group_size") is None  # didn't find a model using this yet
                     for name in self.model_tensors.keys():
                         if name.endswith(".weight_scale"):
                             weight_name = name.removesuffix("_scale")