diff --git a/src/driftpy/clearing_house.py b/src/driftpy/clearing_house.py
index d07f1712..521eadd1 100644
--- a/src/driftpy/clearing_house.py
+++ b/src/driftpy/clearing_house.py
@@ -513,12 +513,19 @@ async def open_position(
         direction: PositionDirection,
         amount: int,
         market_index: int,
+        user_id: int = 0,
         limit_price: int = 0,
         ioc: bool = False,
-        user_id: int = 0,
     ):
         return await self.send_ixs(
-            await self.get_open_position_ix(direction, amount, market_index, limit_price, ioc, user_id=user_id),
+            await self.get_open_position_ix(
+                direction,
+                amount,
+                market_index, 
+                user_id,
+                limit_price,
+                ioc,
+            ),
         )
 
     async def get_open_position_ix(
diff --git a/tests/test.py b/tests/test.py
index 65e49b80..bf5b7470 100644
--- a/tests/test.py
+++ b/tests/test.py
@@ -191,7 +191,7 @@ async def test_init_user(
     user: User = await get_user_account(
         clearing_house.program, 
         clearing_house.authority, 
-        user_id=0
+        subaccount_id=0
     )
     assert user.authority == clearing_house.authority