diff --git a/src/query/index.ts b/src/query/index.ts
index fc1ecd9..aa2ea04 100644
--- a/src/query/index.ts
+++ b/src/query/index.ts
@@ -17,7 +17,7 @@ export default class RpcNetworkQueryFactory {
     query,
     options = {},
   }: {
-    relay: string;
+    relay: string | Buffer;
     query: ClientRPCRequest;
     options?: RpcQueryOptions;
   }): SimpleRpcQuery {
diff --git a/src/query/simple.ts b/src/query/simple.ts
index 3d48af1..9f8fdda 100644
--- a/src/query/simple.ts
+++ b/src/query/simple.ts
@@ -19,7 +19,7 @@ export default class SimpleRpcQuery extends RpcQueryBase {
     options,
   }: {
     network: RpcNetwork;
-    relay?: string | any;
+    relay?: string | Buffer | any;
     query: ClientRPCRequest;
     options: RpcQueryOptions;
   }) {