diff --git a/qubes/storage/reflink.py b/qubes/storage/reflink.py
index bcf2e3dc..20fa2a97 100644
--- a/qubes/storage/reflink.py
+++ b/qubes/storage/reflink.py
@@ -297,10 +297,10 @@ class ReflinkVolume(qubes.storage.Volume):
     @property
     def revisions(self):
         prefix = self._path_clean + '.'
-        paths = glob.glob(glob.escape(prefix) + '*@*Z')
-        items = sorted((path[len(prefix):-1].split('@') for path in paths),
-                       key=lambda item: int(item[0]))
-        return collections.OrderedDict(items)
+        paths = glob.iglob(glob.escape(prefix) + '*@*Z')
+        items = (path[len(prefix):-1].split('@') for path in paths)
+        return collections.OrderedDict(sorted(items,
+                                              key=lambda item: int(item[0])))
 
     @property
     def usage(self):