diff --git a/python/ctranslate2/converters/converter.py b/python/ctranslate2/converters/converter.py
index ecede044a..fd7f7481a 100644
--- a/python/ctranslate2/converters/converter.py
+++ b/python/ctranslate2/converters/converter.py
@@ -5,7 +5,7 @@
 
 from typing import Optional
 
-from ctranslate2.specs.model_spec import ACCEPTED_MODEL_TYPES, ModelSpec
+from ctranslate2.specs.model_spec import ACCEPTED_MODEL_TYPES
 
 
 class Converter(abc.ABC):