diff --git a/freqtrade/exchange/exchange.py b/freqtrade/exchange/exchange.py
index 7629b1e01..f4a06d929 100644
--- a/freqtrade/exchange/exchange.py
+++ b/freqtrade/exchange/exchange.py
@@ -2855,8 +2855,10 @@ def amount_to_precision(amount: float, amount_precision: Optional[float],
     :return: truncated amount
     """
     if amount_precision is not None and precisionMode is not None:
+        precision = int(amount_precision) if precisionMode != TICK_SIZE else amount_precision
+        # precision must be an int for non-ticksize inputs.
         amount = float(decimal_to_precision(amount, rounding_mode=TRUNCATE,
-                                            precision=amount_precision,
+                                            precision=precision,
                                             counting_mode=precisionMode,
                                             ))
 
diff --git a/tests/rpc/test_rpc.py b/tests/rpc/test_rpc.py
index 1a2428fe7..64cad6daf 100644
--- a/tests/rpc/test_rpc.py
+++ b/tests/rpc/test_rpc.py
@@ -761,7 +761,7 @@ def test_rpc_force_exit(default_conf, ticker, fee, mocker) -> None:
     # and trade amount is updated
     rpc._rpc_force_exit('3')
     assert cancel_order_mock.call_count == 1
-    assert trade.amount == filled_amount
+    assert pytest.approx(trade.amount) == filled_amount
 
     mocker.patch(
         'freqtrade.exchange.Exchange.fetch_order',