diff --git a/fireblocks_sdk/sdk.py b/fireblocks_sdk/sdk.py
index 7e67230..9337a04 100644
--- a/fireblocks_sdk/sdk.py
+++ b/fireblocks_sdk/sdk.py
@@ -1777,7 +1777,7 @@ def create_transaction(
         if replace_tx_by_hash:
             body["replaceTxByHash"] = replace_tx_by_hash
 
-        if treat_as_gross_amount:
+        if treat_as_gross_amount is not None:
             body["treatAsGrossAmount"] = treat_as_gross_amount
 
         if destinations: