diff --git a/equipment/fields.py b/equipment/fields.py
index 2b63d52..5e7ecce 100644
--- a/equipment/fields.py
+++ b/equipment/fields.py
@@ -37,7 +37,7 @@ class IdField(models.BigIntegerField):
             k += 1
         return res
 
-    def from_db_value(self, value, expression, connection, context):
+    def from_db_value(self, value, expression, connection):
         if value is None:
             return value
         return self.parse_integer(value)