diff --git a/gnosis/protocol/gnosis_protocol_api.py b/gnosis/protocol/gnosis_protocol_api.py
index 9c1049fb5..30a01738f 100644
--- a/gnosis/protocol/gnosis_protocol_api.py
+++ b/gnosis/protocol/gnosis_protocol_api.py
@@ -85,7 +85,7 @@ def get_quote(
         data_json = {
             "sellToken": order.sellToken.lower(),
             "buyToken": order.buyToken.lower(),
-            "sellAmountBeforeFee": str(order.sellAmount),
+            "sellAmountAfterFee": str(order.sellAmount),
             # "validTo": order.validTo,
             "appData": HexBytes(order.appData).hex()
             if isinstance(order.appData, bytes)