diff --git a/stix2/STIXPatternVisitor.py b/stix2/STIXPatternVisitor.py
index 5339395..a94aa40 100644
--- a/stix2/STIXPatternVisitor.py
+++ b/stix2/STIXPatternVisitor.py
@@ -13,7 +13,8 @@ from stix2.patterns import _BooleanExpression
 from antlr4 import CommonTokenStream, InputStream
 
 # need to import all classes because we need to access them via globals()
-from .patterns import *
+from .patterns import *  # noqa
+
 
 def collapse_lists(lists):
     result = []
@@ -33,7 +34,6 @@ def values_only(things):
     return values
 
 
-
 # This class defines a complete generic visitor for a parse tree produced by STIXPatternParser.