diff --git a/ZipStorage.py b/ZipStorage.py
index cc29392..bafc989 100644
--- a/ZipStorage.py
+++ b/ZipStorage.py
@@ -46,11 +46,7 @@ def inserthierdict(d, name, obj, sep):
 	dname = name[:i]
 	rname = name[i + 1:]
 	# remaining path components
-	try:
-		inserthierdict(d[dname], rname, obj, sep)
-	except KeyError:
-		d[dname] = {}
-		inserthierdict(d[dname], rname, obj, sep)
+	inserthierdict(d.setdefaul(dname, {}), rname, obj, sep)
 
 def buildNameHier(names, objs, sep):
 	ret = {}
@@ -308,8 +304,9 @@ class ZipObject(FSObject, StorageFolder):
 				cnt = newsum
 		self.sep = cursep
 
-		hier = buildNameHier(nl, [ ZIWrap(x) for x in
-		    self.zip.infolist() ], cursep)
+		il = self.zip.infolist()
+
+		hier = buildNameHier(nl, [ ZIWrap(x) for x in il ], cursep)
 
 		return hier