diff --git a/src/query/simple.ts b/src/query/simple.ts
index 3a1101e..3d48af1 100644
--- a/src/query/simple.ts
+++ b/src/query/simple.ts
@@ -24,6 +24,10 @@ export default class SimpleRpcQuery extends RpcQueryBase {
     options: RpcQueryOptions;
   }) {
     super({ network, query, options });
+    if (b4a.isBuffer(relay)) {
+      relay = b4a.from(relay).toString("hex");
+    }
+
     this._relay = relay;
   }