diff --git a/gui/cachingImageList.py b/gui/cachingImageList.py
index 28a195352..904a2c4a8 100644
--- a/gui/cachingImageList.py
+++ b/gui/cachingImageList.py
@@ -25,7 +25,7 @@ class CachingImageList(wx.ImageList):
         wx.ImageList.__init__(self, width, height)
         self.map = {}
 
-    def Add(self, *loaderArgs):
+    def GetImageIndex(self, *loaderArgs):
         id = self.map.get(loaderArgs)
         if id is None:
             bitmap = bitmapLoader.getBitmap(*loaderArgs)
diff --git a/gui/marketBrowser.py b/gui/marketBrowser.py
index 42cc9ade7..0234f8911 100644
--- a/gui/marketBrowser.py
+++ b/gui/marketBrowser.py
@@ -139,7 +139,7 @@ class MarketTree(wx.TreeCtrl):
         if iconFile is None:
             return -1
 
-        return self.imageList.Add(iconFile, "pack")
+        return self.imageList.GetImageIndex(iconFile, "pack")
 
     def expandLookup(self, event):
         root = event.Item