diff --git a/Lib/idlelib/ObjectBrowser.py b/Lib/idlelib/ObjectBrowser.py
index c235a7564f9..416be5a15fc 100644
--- a/Lib/idlelib/ObjectBrowser.py
+++ b/Lib/idlelib/ObjectBrowser.py
@@ -59,7 +59,7 @@ class ObjectTreeItem(TreeItem):
 
 class InstanceTreeItem(ObjectTreeItem):
     def IsExpandable(self):
-        return 1
+        return True
     def GetSubList(self):
         sublist = ObjectTreeItem.GetSubList(self)
         sublist.insert(0,
@@ -68,7 +68,7 @@ class InstanceTreeItem(ObjectTreeItem):
 
 class ClassTreeItem(ObjectTreeItem):
     def IsExpandable(self):
-        return 1
+        return True
     def GetSubList(self):
         sublist = ObjectTreeItem.GetSubList(self)
         if len(self.object.__bases__) == 1: