diff --git a/Makefile b/Makefile
index 734843c..fda142e 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ install: check_prereqs
 	python3 -m pip install -e '.[dev]'
 
 pylinting:
-	pylint singer -d missing-docstring,broad-except,bare-except,too-many-return-statements,too-many-branches,too-many-arguments,no-else-return,too-few-public-methods,fixme,protected-access
+	pylint singer --extension-pkg-whitelist=ciso8601 -d missing-docstring,broad-except,bare-except,too-many-return-statements,too-many-branches,too-many-arguments,no-else-return,too-few-public-methods,fixme,protected-access
 
 test:
 	nosetests --with-doctest -v
diff --git a/singer/transform.py b/singer/transform.py
index c165e38..98d4795 100644
--- a/singer/transform.py
+++ b/singer/transform.py
@@ -46,7 +46,7 @@ def __init__(self, errors):
             msg = "Errors during transform\n\t{}".format("\n\t".join(estrs))
             msg += "\n\n\nErrors during transform: [{}]".format(", ".join(estrs))
 
-        super(SchemaMismatch, self).__init__(msg)
+        super().__init__(msg)
 
 class SchemaKey:
     ref = "$ref"