diff --git a/backend/migrations/20250801062412_create_user_table.sql b/backend/migrations/20250801062412_create_user_table.sql
index 6cc6f44..67194a5 100644
--- a/backend/migrations/20250801062412_create_user_table.sql
+++ b/backend/migrations/20250801062412_create_user_table.sql
@@ -12,7 +12,7 @@ CREATE UNIQUE INDEX IF NOT EXISTS "idx_user_source_id_issuer"
 ON "user" ("source_id", "issuer");
 
 CREATE INDEX IF NOT EXISTS "idx_user_email"
-ON "user" USING HASH ("email");
+ON "user" ("email");
 
 CREATE OR REPLACE TRIGGER "update_user_updated_time"
 BEFORE UPDATE ON "user"