diff --git a/diceware/random_sources.py b/diceware/random_sources.py
index e1e263dc0b3c79232e9aa932c7c5e3dc99ca7f4d..a867a6b66224b8091781938f0a7a6db095a1d270 100644
--- a/diceware/random_sources.py
+++ b/diceware/random_sources.py
@@ -140,8 +140,9 @@ class RealDiceRandomSource(object):
             print(
                 "Warning: entropy is reduced! Using only first %s of %s "
                 "words/items of your wordlist." % (
-                    self.dice_sides ** num_rolls, len(sequence))
-                  )
+                    self.dice_sides ** num_rolls, len(sequence)
+                )
+            )
         print(
             "Please roll %s dice (or a single dice %s times)." % (
                 num_rolls, num_rolls))