diff --git a/flashcards/models.py b/flashcards/models.py
index 995b626..964ccd8 100644
--- a/flashcards/models.py
+++ b/flashcards/models.py
@@ -497,7 +497,7 @@ class JulianDay(Func):
 
 class PostgresIntervalDay(Func):
     function = 'EXTRACT'
-    template_postgres = "(((%(function)s(EPOCH FROM INTERVAL %(expressions)s) / 60) / 60) / 24)::integer"
+    template = "(((%(function)s(EPOCH FROM INTERVAL %(expressions)s) / 60) / 60) / 24)::integer"
     arg_joiner = ' - '
 
     def __init__(self, *expression, **extra):