diff --git a/src/server/index.ts b/src/server/index.ts
index 8686aa63c..0db3b366b 100644
--- a/src/server/index.ts
+++ b/src/server/index.ts
@@ -65,6 +65,7 @@ export const initServer = async () => {
 
   // Start the server with middleware.
   const server: FastifyInstance = fastify({
+    maxParamLength: 200,
     connectionTimeout: SERVER_CONNECTION_TIMEOUT,
     disableRequestLogging: true,
     trustProxy,
diff --git a/src/server/schemas/wallet/index.ts b/src/server/schemas/wallet/index.ts
index cd2c4d024..c4119fa61 100644
--- a/src/server/schemas/wallet/index.ts
+++ b/src/server/schemas/wallet/index.ts
@@ -12,6 +12,7 @@ export const walletHeaderSchema = Type.Object({
   },
   "x-idempotency-key": Type.Optional(
     Type.String({
+      maxLength: 200,
       description: `Transactions submitted with the same idempotency key will be de-duplicated. Only the last ${env.TRANSACTION_HISTORY_COUNT} transactions are compared.`,
     }),
   ),