diff --git a/lib/Transport.d.ts b/lib/Transport.d.ts
index 00130aa66..c35d57aa6 100644
--- a/lib/Transport.d.ts
+++ b/lib/Transport.d.ts
@@ -80,7 +80,7 @@ export interface TransportRequestParams {
   path: string;
   body?: RequestBody;
   bulkBody?: RequestNDBody;
-  querystring?: Record<string, any>;
+  querystring?: Record<string, any> | string;
 }
 
 export interface TransportRequestOptions {
diff --git a/test/types/transport.test-d.ts b/test/types/transport.test-d.ts
index ef77b2292..bc51fc4c1 100644
--- a/test/types/transport.test-d.ts
+++ b/test/types/transport.test-d.ts
@@ -102,6 +102,16 @@ expectType<Transport>(transport)
 
 expectType<TransportRequestCallback>(transport.request(params, options, (err, result) => {}))
 
+// querystring as string
+transport.request({
+  method: 'GET',
+  path: '/search',
+  querystring: 'baz=faz'
+}, options, (err, result) => {
+  expectType<ApiError>(err)
+  expectType<ApiResponse>(result)
+})
+
 // body as object
 transport.request(params, options, (err, result) => {
   expectType<ApiError>(err)