diff --git a/migrations/000108_create_voucher_tables.up.sql b/migrations/000108_create_voucher_tables.up.sql
index 4590178..27c23e4 100644
--- a/migrations/000108_create_voucher_tables.up.sql
+++ b/migrations/000108_create_voucher_tables.up.sql
@@ -2,6 +2,21 @@
 -- which budget (docs/rfc-enakgame.md §5.7, D5). Replaces the unused rewards table for
 -- EnakGame; rewards itself stays.
 
+-- Some databases still have the vouchers table of the reverted Voucher Undian feature
+-- (commit cfe690a). Keep its data under another name; its primary key index is renamed
+-- too, or vouchers_pkey below would clash.
+DO $$
+BEGIN
+    IF EXISTS (
+        SELECT 1 FROM information_schema.columns
+        WHERE table_schema = current_schema() AND table_name = 'vouchers' AND column_name = 'winner_number'
+    ) THEN
+        ALTER TABLE vouchers RENAME TO vouchers_undian_legacy;
+        ALTER INDEX IF EXISTS vouchers_pkey RENAME TO vouchers_undian_legacy_pkey;
+        ALTER INDEX IF EXISTS vouchers_voucher_code_key RENAME TO vouchers_undian_legacy_voucher_code_key;
+    END IF;
+END $$;
+
 CREATE TABLE vouchers (
     id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
     organization_id UUID NOT NULL,