diff --git a/freqtrade/strategy/interface.py b/freqtrade/strategy/interface.py
index c67870aeb..e9d5b904d 100644
--- a/freqtrade/strategy/interface.py
+++ b/freqtrade/strategy/interface.py
@@ -42,7 +42,7 @@ class IStrategy(ABC):
     stoploss: float
     ticker_interval: str
 
-    def __init__(self, config: dict):
+    def __init__(self, config: dict) -> None:
         self.config = config
 
     @abstractmethod