diff --git a/gamestonk_terminal/helper_funcs.py b/gamestonk_terminal/helper_funcs.py
index ca59f38e8fa..0aa4a1a40a4 100644
--- a/gamestonk_terminal/helper_funcs.py
+++ b/gamestonk_terminal/helper_funcs.py
@@ -307,4 +307,6 @@ def check_sources(source: str) -> str:
     available_historical_price_sources = ["quandl", "av"]
     if source in available_historical_price_sources:
         return source
-    raise argparse.ArgumentTypeError("This source for historical data is not available.")
\ No newline at end of file
+    raise argparse.ArgumentTypeError(
+        "This source for historical data is not available."
+    )