diff --git a/trade.py b/trade.py
index c6612d36..ab12b39b 100644
--- a/trade.py
+++ b/trade.py
@@ -32,7 +32,7 @@
 ######################################################################
 # Database and calculator modules.
 
-from tradedb import TradeDB
+from tradedb import TradeDB, AmbiguityError
 from tradecalc import Route, TradeCalc, localedNo
 
 tdb = TradeDB('.\\TradeDangerous.accdb')