diff --git a/DDDigi/python/digitize.py b/DDDigi/python/digitize.py
index fea211963c68a9e3d32314acbd18dc038d15b68a..e7170f94df23494714a54fedcb88e6af9c27f2f5 100644
--- a/DDDigi/python/digitize.py
+++ b/DDDigi/python/digitize.py
@@ -149,7 +149,7 @@ class Digitize(dd4hep.Logger):
     self.info('+++  List of sensitive detectors:')
     dets = self.activeDetectors()
     for d in dets:
-      self.info('+++  %-32s ---> type:%-12s', d['name'], d['type'])
+      self.info('+++  %-32s ---> type:%-12s' % (d['name'], d['type'],))
 
   """
      Configure ROOT output for the event digitization