diff --git a/cogs/birthday.py b/cogs/birthday.py
index 11a5a49..8c5b429 100644
--- a/cogs/birthday.py
+++ b/cogs/birthday.py
@@ -55,7 +55,7 @@ class Birthday:
                     'member': member
                 })
 
-        return sort_birthdays(_entries)
+        return self.sort_birthdays(_entries)
 
     async def birthday_task(self):
         while True: