diff --git a/src/config.ml b/src/config.ml
index 82fa9514..64bd756c 100644
--- a/src/config.ml
+++ b/src/config.ml
@@ -7,7 +7,7 @@ let dummy_duration = Ptime.Span.of_int_s 99999999
 module Exchange = struct
   let currency = "EUR"
   let currency_round_unit = amount "EUR:0.01"
-  let db = "postgres"
+  let db = `Pgx (* plugin to use for the database *)
   let attribute_encryption_key = "uhuhg" (* high-entropy nonce. *)
   let port = 3434