diff --git a/src/features/conversation/conversation_base.py b/src/features/conversation/conversation_base.py
index d9857d3f..c0ea563e 100644
--- a/src/features/conversation/conversation_base.py
+++ b/src/features/conversation/conversation_base.py
@@ -19,7 +19,7 @@ def base_conversation_features(conversation_data, day_segment, requested_feature
         if not conversation_data.empty:
             conversation_features = pd.DataFrame()
 
-            conversation_data = conversation_data.drop_duplicates(subset = 'local_time', keep= first)
+            conversation_data = conversation_data.drop_duplicates(subset="local_time", keep="first")
 
             if "minutessilence" in features_to_compute:
                 conversation_features["conversation_" + day_segment + "_minutessilence"] = conversation_data[conversation_data['inference']==0].groupby(["local_date"])['inference'].count()/60