diff --git a/mercurial/dispatch.py b/mercurial/dispatch.py
--- a/mercurial/dispatch.py
+++ b/mercurial/dispatch.py
@@ -183,7 +183,7 @@ def dispatch(req):
         if req.ui.logblockedtimes:
             req.ui._blockedtimes['command_duration'] = duration * 1000
             req.ui.log('uiblocked', 'ui blocked ms', **req.ui._blockedtimes)
-        req.ui.log("commandfinish", "%s exited %s after %0.2f seconds\n",
+        req.ui.log("commandfinish", "%s exited %d after %0.2f seconds\n",
                    msg, ret or 0, duration)
         try:
             req._runexithandlers()