diff --git a/zipline/test/algorithms.py b/zipline/test/algorithms.py
index 3b33eb38..fb337508 100644
--- a/zipline/test/algorithms.py
+++ b/zipline/test/algorithms.py
@@ -76,5 +76,5 @@ class NoopAlgorithm(object):
     def handle_frame(self, frame):
         pass
     
-    def get_sid_filter():
+    def get_sid_filter(self):
         return None
\ No newline at end of file