diff --git a/lib/redmine/i18n.rb b/lib/redmine/i18n.rb
index d1e89c129..ef6f04f3f 100644
--- a/lib/redmine/i18n.rb
+++ b/lib/redmine/i18n.rb
@@ -89,7 +89,7 @@ module Redmine
       if Setting.timespan_format == 'minutes'
         h = hours.floor
         m = ((hours - h) * 60).round
-        "%d:%02d" % [ h, m ]
+        "%d:%02d" % [h, m]
       else
         "%.2f" % hours.to_f
       end