diff --git a/zipline/testing/fixtures.py b/zipline/testing/fixtures.py
index 901a985e..0909cc58 100644
--- a/zipline/testing/fixtures.py
+++ b/zipline/testing/fixtures.py
@@ -126,7 +126,7 @@ class ZiplineTestCase(with_metaclass(FinalMeta, TestCase)):
 
 class WithLogger(object):
     """
-    ZiplineTestCase mixing providing cls.log_handler as an instance-level
+    ZiplineTestCase mixin providing cls.log_handler as an instance-level
     fixture.
 
     After init_instance_fixtures has been called `self.log_handler` will be a