diff --git a/panel/command/convert.py b/panel/command/convert.py
index affc02a384..04e1a03443 100644
--- a/panel/command/convert.py
+++ b/panel/command/convert.py
@@ -114,7 +114,7 @@ def invoke(self, args: argparse.Namespace) -> None:
         for f in args.files:
             p = pathlib.Path(f).absolute()
             if not p.is_file():
-                raise ValueError('File {f!r} not found.')
+                raise ValueError(f'File {f!r} not found.')
             elif p not in excluded:
                 included.append(p)