diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index af3e4c3eb..e0da0878d 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -651,7 +651,7 @@ class Exchange:
         Re-implementation of ccxt internal methods - ensuring we can test the result is correct
         based on our definitions.
         """
-        if self.markets[pair]['precision']['amount']:
+        if self.markets[pair]['precision']['amount'] is not None:
             amount = float(decimal_to_precision(amount, rounding_mode=TRUNCATE,
                                                 precision=self.markets[pair]['precision']['amount'],
                                                 counting_mode=self.precisionMode,