diff --git a/dvadmin-backend/application/settings.py b/dvadmin-backend/application/settings.py
index 03d0924..e1b13ae 100644
--- a/dvadmin-backend/application/settings.py
+++ b/dvadmin-backend/application/settings.py
@@ -313,4 +313,3 @@ CAPTCHA_NOISE_FUNCTIONS = (
                            )
 # CAPTCHA_CHALLENGE_FUNCT = 'captcha.helpers.random_char_challenge'
 CAPTCHA_CHALLENGE_FUNCT = 'captcha.helpers.math_challenge'
-DEFAULT_LOOKUP_EXPR = 'icontains'