diff --git a/freqtrade/strategy/interface.py b/freqtrade/strategy/interface.py
index dcf665a02..4ae358c6f 100644
--- a/freqtrade/strategy/interface.py
+++ b/freqtrade/strategy/interface.py
@@ -2,7 +2,7 @@
 IStrategy interface
 This module defines the interface to apply for strategies
 """
-
+from typing import Dict
 from abc import ABC, abstractmethod
 
 from pandas import DataFrame
@@ -16,9 +16,13 @@ class IStrategy(ABC):
     Attributes you can use:
         minimal_roi -> Dict: Minimal ROI designed for the strategy
         stoploss -> float: optimal stoploss designed for the strategy
-        ticker_interval -> int: value of the ticker interval to use for the strategy
+        ticker_interval -> str: value of the ticker interval to use for the strategy
     """
 
+    minimal_roi: Dict
+    stoploss: float
+    ticker_interval: str
+
     @abstractmethod
     def populate_indicators(self, dataframe: DataFrame) -> DataFrame:
         """