diff --git a/contrib/perf.py b/contrib/perf.py
--- a/contrib/perf.py
+++ b/contrib/perf.py
@@ -861,7 +861,21 @@
         ctx = scmutil.revsingle(repo, rev, rev)
         t = ctx.manifestnode()
     else:
-        t = repo.manifestlog._revlog.lookup(rev)
+        from mercurial.node import bin
+
+        if len(rev) == 40:
+            t = bin(rev)
+        else:
+            try:
+                rev = int(rev)
+
+                if util.safehasattr(repo.manifestlog, 'getstorage'):
+                    t = repo.manifestlog.getstorage(b'').node(rev)
+                else:
+                    t = repo.manifestlog._revlog.lookup(rev)
+            except ValueError:
+                raise error.Abort('manifest revision must be integer or full '
+                                  'node')
     def d():
         repo.manifestlog.clearcaches(clear_persisted_data=clear_disk)
         repo.manifestlog[t].read()
diff --git a/tests/test-contrib-perf.t b/tests/test-contrib-perf.t
--- a/tests/test-contrib-perf.t
+++ b/tests/test-contrib-perf.t
@@ -166,6 +166,10 @@
   $ hg perflookup 2
   $ hg perflrucache
   $ hg perfmanifest 2
+  $ hg perfmanifest -m 44fe2c8352bb3a478ffd7d8350bbc721920134d1
+  $ hg perfmanifest -m 44fe2c8352bb
+  abort: manifest revision must be integer or full node
+  [255]
   $ hg perfmergecalculate -r 3
   $ hg perfmoonwalk
   $ hg perfnodelookup 2