diff --git a/whipper/command/cd.py b/whipper/command/cd.py
index cee7a018..b9c95c9b 100644
--- a/whipper/command/cd.py
+++ b/whipper/command/cd.py
@@ -503,8 +503,7 @@ def _ripIfNotRipped(number):
                     else:
                         raise RuntimeError("track can't be ripped. "
                                            "Rip attempts number is equal "
-                                           "to %d",
-                                           self.options.max_retries)
+                                           "to {}".format(self.options.max_retries))
                 if trackResult in self.skipped_tracks:
                     print("Skipping CRC comparison for track %d "
                           "due to rip failure" % number)