diff --git a/stix2/STIXPatternVisitor.py b/stix2/pattern_visitor.py
similarity index 100%
rename from stix2/STIXPatternVisitor.py
rename to stix2/pattern_visitor.py
diff --git a/stix2/test/test_pattern_expressions.py b/stix2/test/test_pattern_expressions.py
index 62dc242..ac98489 100644
--- a/stix2/test/test_pattern_expressions.py
+++ b/stix2/test/test_pattern_expressions.py
@@ -3,7 +3,7 @@ import datetime
 import pytest
 
 import stix2
-from stix2.STIXPatternVisitor import create_pattern_object
+from stix2.pattern_visitor import create_pattern_object
 
 
 def test_create_comparison_expression():