diff --git a/src/api/v1/users/views.py b/src/api/v1/users/views.py
index b61ddb1..b70cce0 100644
--- a/src/api/v1/users/views.py
+++ b/src/api/v1/users/views.py
@@ -235,7 +235,7 @@ def post(self, request):
         user_data = {'invited_by_code': None}
 
         if invited_by_code:
-            user = User.objects.filter(invite_code=invited_by_code)
+            user = User.objects.filter(invite_code__iexact=invited_by_code)
             if not user.exists():
                 return Response(
                     {'invited_by_code': 'Неверный реферальный код.'},