diff --git a/gui/shipBrowser.py b/gui/shipBrowser.py
index 453607a69..29971f74c 100644
--- a/gui/shipBrowser.py
+++ b/gui/shipBrowser.py
@@ -757,7 +757,7 @@ class ShipBrowser(wx.Panel):
 
 
         sMarket = service.Market.getInstance()
-        sMarket.getShipListDelayed(self.stage2Callback, categoryID)
+        sMarket.getShipListDelayed(categoryID, self.stage2Callback)
 
         self._stage2Data = categoryID
 
diff --git a/service/market.py b/service/market.py
index 8fd701b71..7432a5f1c 100644
--- a/service/market.py
+++ b/service/market.py
@@ -51,7 +51,7 @@ class ShipBrowserWorkerThread(threading.Thread):
         sMarket = Market.getInstance()
         while True:
             try:
-                callback, id = queue.get()
+                id, callback = queue.get()
                 set = cache.get(id)
                 if set is None:
                     set = sMarket.getShipList(id)