diff --git a/ibkr/client.py b/ibkr/client.py
index acc86b1..a60d667 100644
--- a/ibkr/client.py
+++ b/ibkr/client.py
@@ -80,7 +80,7 @@ class Client:
         self.ib.qualifyContracts(option_contract)
         return option_contract
 
-    def submit_combo_option_order(self, legs: List[OptionLeg], quantity: int, limit_price: float = None) -> Trade:
+    def submit_combo_option_order(self, legs: List[OptionLeg], quantity: int = 1, limit_price: float = None) -> Trade:
         combo_legs = []
         for leg in legs:
             option_contract = self.get_option_contract(leg)
@@ -112,7 +112,7 @@ class Client:
 
         return self.ib.placeOrder(combo_contract, combo_order)
 
-    def submit_single_option_order(self, leg: OptionLeg, quantity: int, limit_price: float = None) -> Trade:
+    def submit_single_option_order(self, leg: OptionLeg, quantity: int = 1, limit_price: float = None) -> Trade:
         option_contract = self.get_option_contract(leg)
         contract = Contract()
         contract.conId = option_contract.conId
@@ -137,7 +137,7 @@ class Client:
         leg_mid = (leg_data.ask + max(leg_data.bid, 0)) / 2.0
         leg_limit = (leg_mid - 0.25) - (leg_mid % 0.05)
 
-        option_order = self.submit_single_option_order(leg_data, 1, limit_price = leg_limit)
+        option_order = self.submit_single_option_order(leg_data, limit_price = leg_limit)
         while not option_order.isDone():
             self.ib.waitOnUpdate()
  
@@ -153,12 +153,12 @@ class Client:
         spread_mid = short_leg_mid - long_leg_mid
         spread_limit = (spread_mid - 0.25) - (spread_mid % 0.05)
 
-        spread_order = self.submit_combo_option_order([short_leg, long_leg], 1, limit_price = spread_limit)
+        spread_order = self.submit_combo_option_order([short_leg, long_leg], limit_price = spread_limit)
         while not spread_order.isDone():
             self.ib.waitOnUpdate()
  
         return OptionOrder(spread_order)
-    
+
     def submit_stop_loss_order(self, trade: Trade, stop_loss_price: float, limit_price: float = None) -> Trade:
         stop_loss_order = Order()
         stop_loss_order.action = SELL if trade.order.action == BUY else BUY