diff --git a/hgext/churn.py b/hgext/churn.py
--- a/hgext/churn.py
+++ b/hgext/churn.py
@@ -63,7 +63,7 @@ def countrate(ui, repo, amap, *pats, **o
         key = getkey(ctx)
         key = amap.get(key, key) # alias remap
         if opts.get('changesets'):
-            rate[key] = rate.get(key, 0) + 1
+            rate[key] = (rate.get(key, (0,))[0] + 1, 0)
         else:
             parents = ctx.parents()
             if len(parents) > 1:
diff --git a/tests/test-churn b/tests/test-churn
--- a/tests/test-churn
+++ b/tests/test-churn
@@ -55,6 +55,9 @@ hg rm d/g/f2.txt
 hg ci -Am "removed d/g/f2.txt" -u user1 -d 14:00 d/g/f2.txt
 hg churn --diffstat
 
+echo % changeset number churn
+hg churn -c
+
 cd ..
 
 # issue 833: ZeroDivisionError
diff --git a/tests/test-churn.out b/tests/test-churn.out
--- a/tests/test-churn.out
+++ b/tests/test-churn.out
@@ -32,5 +32,9 @@ 13      1 *****************
 user1           +3/-1 +++++++++++++++++++++++++++++++++++++++++--------------
 user3           +3/-0 +++++++++++++++++++++++++++++++++++++++++
 user2           +2/-0 +++++++++++++++++++++++++++
+% changeset number churn
+user1      4 ***************************************************************
+user3      3 ***********************************************
+user2      2 ********************************
 adding foo
 test      0