diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index ce2c06ae0..65b9fb628 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -946,7 +946,7 @@ class Exchange:
 
     # Order handling
 
-    def _lev_prep(self, pair: str, leverage: float, side: str):
+    def _lev_prep(self, pair: str, leverage: float, side: BuySell):
         if self.trading_mode != TradingMode.SPOT:
             self.set_margin_mode(pair, self.margin_mode)
             self._set_leverage(leverage, pair)
@@ -1068,7 +1068,7 @@ class Exchange:
 
     @retrier(retries=0)
     def stoploss(self, pair: str, amount: float, stop_price: float, order_types: Dict,
-                 side: str, leverage: float) -> Dict:
+                 side: BuySell, leverage: float) -> Dict:
         """
         creates a stoploss order.
         requires `_ft_has['stoploss_order_types']` to be set as a dict mapping limit and market
diff --git a/freqtrade/exchange/ftx.py b/freqtrade/exchange/ftx.py
index d2dcf84a6..65c2a53ca 100644
--- a/freqtrade/exchange/ftx.py
+++ b/freqtrade/exchange/ftx.py
@@ -4,6 +4,7 @@ from typing import Any, Dict, List, Tuple
 
 import ccxt
 
+from freqtrade.constants import BuySell
 from freqtrade.enums import MarginMode, TradingMode
 from freqtrade.exceptions import (DDosProtection, InsufficientFundsError, InvalidOrderException,
                                   OperationalException, TemporaryError)
@@ -44,7 +45,7 @@ class Ftx(Exchange):
 
     @retrier(retries=0)
     def stoploss(self, pair: str, amount: float, stop_price: float,
-                 order_types: Dict, side: str, leverage: float) -> Dict:
+                 order_types: Dict, side: BuySell, leverage: float) -> Dict:
         """
         Creates a stoploss order.
         depending on order_types.stoploss configuration, uses 'market' or limit order.
diff --git a/freqtrade/exchange/kraken.py b/freqtrade/exchange/kraken.py
index ea9b73fab..33a2c7f87 100644
--- a/freqtrade/exchange/kraken.py
+++ b/freqtrade/exchange/kraken.py
@@ -96,7 +96,7 @@ class Kraken(Exchange):
 
     @retrier(retries=0)
     def stoploss(self, pair: str, amount: float, stop_price: float,
-                 order_types: Dict, side: str, leverage: float) -> Dict:
+                 order_types: Dict, side: BuySell, leverage: float) -> Dict:
         """
         Creates a stoploss market order.
         Stoploss market orders is the only stoploss type supported by kraken.