diff --git a/re.py b/re.py
index 2b358f8..071dbe1 100644
--- a/re.py
+++ b/re.py
@@ -51,11 +51,11 @@ class Engine:
     def __init__(self):
         pass
 
-    def _shift_clips(clips):
+    def _shift_clips(self, clips):
         index = random.randrange(len(clips))
         return clips[index:] + clips[:index - 1]
 
-    def get_videos(user):
+    def get_videos(self, user):
         products = []
         for event in user['events']:
             if 'product' in event['data']: