diff --git a/src/stages/audio.py b/src/stages/audio.py
index a76894c..46b015c 100644
--- a/src/stages/audio.py
+++ b/src/stages/audio.py
@@ -163,8 +163,8 @@ def _build_time_frames(self, df: pd.DataFrame):
         df["startTime"] = df["startTime"].astype(str).apply(lambda x: x.split(".")[0])
         df["endTime"] = df["endTime"].astype(str).apply(lambda x: x.split(".")[0])
         
-        df["startTime"] = pd.to_datetime(df["startDate"].astype(str) + ' ' + df["startTime"])
-        df["endTime"] = pd.to_datetime(df["startDate"].astype(str) + ' ' + df["endTime"])
+        df["startTime"] = pd.to_datetime(" ".join([df["startDate"].astype(str), df["startTime"]))
+        df["endTime"] = pd.to_datetime(" ".join([df["startDate"].astype(str), df["endTime"]]))
 
         df["start_time"] = df.startTime - timedelta(seconds=margin)
         df["end_time"] = df.endTime + timedelta(seconds=margin)