diff --git a/schemas/tiers/type_tiers.py b/schemas/tiers/type_tiers.py
index a14b3e7..c5a8cf1 100644
--- a/schemas/tiers/type_tiers.py
+++ b/schemas/tiers/type_tiers.py
@@ -1,3 +1,5 @@
+from enum import Enum
+
 class TypeTiers(str, Enum):
     """Types de tiers possibles"""
     ALL = "all"