diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -278,14 +278,17 @@
             off += s
             e = indexformatv0_unpack(cur)
             # transform to revlogv1 format
-            e2 = (offset_type(e[0], 0), e[1], -1, e[2], e[3],
-                  nodemap.get(e[4], nullrev), nodemap.get(e[5], nullrev), e[6])
+            e2 = parsers.IndexV1Entry(offset_type(e[0], 0), e[1], -1,
+                                      e[2], e[3],
+                                      nodemap.get(e[4], nullrev),
+                                      nodemap.get(e[5], nullrev),
+                                       e[6])
             index.append(e2)
             nodemap[e[6]] = n
             n += 1
 
         # add the magic null revision at -1
-        index.append((0, 0, 0, -1, -1, -1, -1, nullid))
+        index.append(parsers.IndexV1Entry(0, 0, 0, -1, -1, -1, -1, nullid))
 
         return index, nodemap, None