diff --git a/templates/types/streaming/express/src/controllers/llamaindex-stream.ts b/templates/types/streaming/express/src/controllers/llamaindex-stream.ts
index df2c17ffc34744d044ecdcc375955dbc7ea5ba70..68ad22a0f50b542f9c322ef649cdc7fe2f16282a 100644
--- a/templates/types/streaming/express/src/controllers/llamaindex-stream.ts
+++ b/templates/types/streaming/express/src/controllers/llamaindex-stream.ts
@@ -74,7 +74,7 @@ export function LlamaIndexStream(
     callbacks?: AIStreamCallbacksAndOptions;
     parserOptions?: ParserOptions;
   },
-): ReadableStream<string> {
+): ReadableStream<Uint8Array> {
   return createParser(response, data, opts?.parserOptions)
     .pipeThrough(createCallbacksTransformer(opts?.callbacks))
     .pipeThrough(createStreamDataTransformer());
diff --git a/templates/types/streaming/nextjs/app/api/chat/llamaindex-stream.ts b/templates/types/streaming/nextjs/app/api/chat/llamaindex-stream.ts
index df2c17ffc34744d044ecdcc375955dbc7ea5ba70..68ad22a0f50b542f9c322ef649cdc7fe2f16282a 100644
--- a/templates/types/streaming/nextjs/app/api/chat/llamaindex-stream.ts
+++ b/templates/types/streaming/nextjs/app/api/chat/llamaindex-stream.ts
@@ -74,7 +74,7 @@ export function LlamaIndexStream(
     callbacks?: AIStreamCallbacksAndOptions;
     parserOptions?: ParserOptions;
   },
-): ReadableStream<string> {
+): ReadableStream<Uint8Array> {
   return createParser(response, data, opts?.parserOptions)
     .pipeThrough(createCallbacksTransformer(opts?.callbacks))
     .pipeThrough(createStreamDataTransformer());