diff --git a/packages/taler-util/src/transactions-types.ts b/packages/taler-util/src/transactions-types.ts
index 083124afa..88830d82b 100644
--- a/packages/taler-util/src/transactions-types.ts
+++ b/packages/taler-util/src/transactions-types.ts
@@ -43,6 +43,8 @@ import {
   codecForList,
   codecForAny,
   codecForBoolean,
+  codecForEither,
+  codecForConstString,
 } from "./codec.js";
 import {
   RefreshReason,
@@ -697,6 +699,15 @@ export const codecForTransactionsRequest = (): Codec<TransactionsRequest> =>
   buildCodecForObject<TransactionsRequest>()
     .property("currency", codecOptional(codecForString()))
     .property("search", codecOptional(codecForString()))
+    .property(
+      "sort",
+      codecOptional(
+        codecForEither(
+          codecForConstString("ascending"),
+          codecForConstString("descending"),
+        ),
+      ),
+    )
     .property("includeRefreshes", codecOptional(codecForBoolean()))
     .build("TransactionsRequest");