diff --git a/ui/src/api/chat.ts b/ui/src/api/chat.ts
index 233742ac..6d5d5a94 100644
--- a/ui/src/api/chat.ts
+++ b/ui/src/api/chat.ts
@@ -62,7 +62,7 @@ export const chatApi = {
 
   async postMessageAndStream(
     conversationId: string,
-    data: { content: string; agentId?: string },
+    data: { content: string; agentId?: string; voiceMode?: string },
     callbacks: {
       onToken: (token: string) => void;
       onDone: (messageId: string, content: string) => void;
diff --git a/ui/src/hooks/useStreamingChat.ts b/ui/src/hooks/useStreamingChat.ts
index 85b24228..f76cfdb0 100644
--- a/ui/src/hooks/useStreamingChat.ts
+++ b/ui/src/hooks/useStreamingChat.ts
@@ -10,7 +10,7 @@ export function useStreamingChat(conversationId: string | null) {
   const [, startTransition] = useTransition();
 
   const startStream = useCallback(
-    (userMessage: string, agentId?: string) => {
+    (userMessage: string, agentId?: string, voiceMode?: string) => {
       if (!conversationId) return;
 
       setIsStreaming(true);
@@ -21,7 +21,7 @@ export function useStreamingChat(conversationId: string | null) {
 
       chatApi.postMessageAndStream(
         conversationId,
-        { content: userMessage, agentId },
+        { content: userMessage, agentId, voiceMode },
         {
           onToken: (token: string) => {
             startTransition(() => {