diff --git a/whipper/command/cd.py b/whipper/command/cd.py
index da4bcc0a..5705d089 100644
--- a/whipper/command/cd.py
+++ b/whipper/command/cd.py
@@ -493,7 +493,7 @@ def _ripIfNotRipped(number):
                     logger.critical('giving up on track %d after %d times',
                                     number, tries)
                     if self.options.keep_going:
-                        logger.warning("track %d failed to rip.", number)
+                        logger.warning("track %d failed to rip." % number)
                         logger.debug("adding %s to skipped_tracks",
                                      trackResult)
                         self.skipped_tracks.append(trackResult)