diff --git a/crypto_seller/__init__.py b/crypto_seller/__init__.py
index d3dd1ee..2622a38 100644
--- a/crypto_seller/__init__.py
+++ b/crypto_seller/__init__.py
@@ -119,7 +119,7 @@ import datetime
 import logging
 import random
 from collections.abc import Callable
-from decimal import Decimal
+from decimal import Decimal, ROUND_DOWN
 from typing import Any
 
 import fin_defs
@@ -192,6 +192,9 @@ def sample_from_range(rng: random.Random, rang: tuple[Any, Any]) -> Any:
     return rang[0] + (rang[1] - rang[0]) * multiplier
 
 
+ROUND_TO_WHOLE = Decimal('1')
+
+
 def run_auto_sell(config: AutoSellConfig) -> AutoSellRunResults:
     """Executes the sell-off.
 
@@ -214,7 +217,7 @@ def run_auto_sell(config: AutoSellConfig) -> AutoSellRunResults:
         if input_amount_available > 0:
             amount_to_sell = sample_from_range(rng, config.input_amount_range)
             amount_to_sell = min(input_amount_available, amount_to_sell)
-            amount_to_sell = int(amount_to_sell + Decimal('0.5'))
+            amount_to_sell = amount_to_sell.quantize(ROUND_TO_WHOLE, rounding=ROUND_DOWN)
             logger.info('Attempting to sell %s %s', amount_to_sell, config.input_asset)
 
             order_details = config.seller.place_market_order(
diff --git a/test/test_auto_sell.py b/test/test_auto_sell.py
index 64c6075..e930211 100644
--- a/test/test_auto_sell.py
+++ b/test/test_auto_sell.py
@@ -26,7 +26,7 @@ class SellerMock(fin_depo.data.DepoFetcher):
         input_asset: fin_defs.Asset,
         input_amount: Decimal,
         output_asset: fin_defs.Asset,
-    ) -> fin_depo.data.Depo:
+    ) -> fin_depo.data.TradeOrderDetails:
         assert input_amount <= self.amount_left, 'Attempt to sell too much'
         self.amount_left -= input_amount
 
@@ -40,7 +40,7 @@ class SellerMock(fin_depo.data.DepoFetcher):
             output_amount=input_amount,
             fee_asset=input_asset,
             fee_amount=Decimal(0),
-            order_id=10000000 - self.amount_left,
+            order_id=Decimal(10000000 - self.amount_left),
             raw_order_details={'TEST': 1, 'DATA': 2},
         )