diff --git a/InvestopediaApi/ita.py b/InvestopediaApi/ita.py
index b39a417..fa34b95 100644
--- a/InvestopediaApi/ita.py
+++ b/InvestopediaApi/ita.py
@@ -219,6 +219,7 @@ def trade(self, symbol, orderType, quantity, priceType="Market", price=False, du
         client.trade("GOOG", Action.buy, 10)
         client.trade("GOOG", Action.buy, 10, "Limit", 500)
         """
+        quantity = int(quantity)
 
         br = self.br
         trade_page = self.fetch('/simulator/trade/tradestock.aspx')