diff --git a/packages/rest-client/src/rest.ts b/packages/rest-client/src/rest.ts
index ad6fdb550a..2a04572166 100644
--- a/packages/rest-client/src/rest.ts
+++ b/packages/rest-client/src/rest.ts
@@ -201,7 +201,7 @@ class RestClientImpl implements RestClient {
         if (!response.ok) {
           throw new Error(response.statusText)
         }
-        return await extractJson<MessagesGroup[]>(response)
+        return await extractJson<Message[]>(response)
       },
       { retries }
     )
diff --git a/packages/rest-client/src/utils.ts b/packages/rest-client/src/utils.ts
index 3f7712c5fb..29314845dc 100644
--- a/packages/rest-client/src/utils.ts
+++ b/packages/rest-client/src/utils.ts
@@ -27,7 +27,7 @@ function reviver (key: string, value: any): Date {
   return value
 }
 
-export async function extractJson<T> (response: Response): Promise<any> {
+export async function extractJson<T> (response: Response): Promise<T> {
   const encoding = response.headers.get('content-encoding')
   if (encoding === 'snappy') {
     const buffer = await response.arrayBuffer()