diff --git a/pelican/urlwrappers.py b/pelican/urlwrappers.py
index f92d1963..06cfa2ab 100644
--- a/pelican/urlwrappers.py
+++ b/pelican/urlwrappers.py
@@ -70,7 +70,7 @@ class URLWrapper(object):
         setting = "%s_%s" % (self.__class__.__name__.upper(), key)
         value = self.settings[setting]
         if not isinstance(value, six.string_types):
-            logger.warning('%s is set to %s', (setting, value))
+            logger.warning('%s is set to %s', setting, value)
             return value
         else:
             if get_page_name: