diff --git a/alpaca_backtrader_api/alpacabroker.py b/alpaca_backtrader_api/alpacabroker.py
index 6efafc5d..2a3d781e 100644
--- a/alpaca_backtrader_api/alpacabroker.py
+++ b/alpaca_backtrader_api/alpacabroker.py
@@ -86,7 +86,7 @@ def update_positions(self):
 
             for name, data in iteritems(self.cerebro.datasbyname):
                 if name in broker_positions_symbols:
-                    size = int(broker_positions_mapped_by_symbol[name].qty)
+                    size = float(broker_positions_mapped_by_symbol[name].qty)
                     positions[data] = Position(
                         size,
                         float(broker_positions_mapped_by_symbol[