diff --git a/convert-hf-to-gguf.py b/convert-hf-to-gguf.py
index 937dfcc56..a6f5e58d1 100755
--- a/convert-hf-to-gguf.py
+++ b/convert-hf-to-gguf.py
@@ -279,7 +279,7 @@ class Model:
             return gguf.MODEL_ARCH.BERT
         if arch == "NomicBertModel":
             return gguf.MODEL_ARCH.NOMIC_BERT
-        if arch in "GemmaForCausalLM":
+        if arch == "GemmaForCausalLM":
             return gguf.MODEL_ARCH.GEMMA
 
         raise NotImplementedError(f'Architecture "{arch}" not supported!')