diff --git a/stix2/patterns.py b/stix2/patterns.py
index 8f0b8c7..7858146 100644
--- a/stix2/patterns.py
+++ b/stix2/patterns.py
@@ -27,7 +27,6 @@ class TimestampConstant(_Constant):
         return "'%s'" % escape_quotes_and_backslashes(self.value)
 
 
-
 class IntegerConstant(_Constant):
     def __init__(self, value):
         try: