1 files changed, 1 insertions, 1 deletions

diff --git a/subcmds/checkout.py b/subcmds/checkout.py
index ea48263e..379bfa18 100644
--- a/subcmds/checkout.py
+++ b/subcmds/checkout.py
@@ -96,7 +96,7 @@ The command is equivalent to:
             all_projects,
             callback=_ProcessResults,
             output=Progress(
-                "Checkout %s" % (nb,), len(all_projects), quiet=opt.quiet
+                f"Checkout {nb}", len(all_projects), quiet=opt.quiet
             ),
         )