diff --git a/backend/open_webui/routers/audio.py b/backend/open_webui/routers/audio.py
index cb7a57b5b7e..806b3f14ab2 100644
--- a/backend/open_webui/routers/audio.py
+++ b/backend/open_webui/routers/audio.py
@@ -1024,7 +1024,10 @@ def get_available_models(request: Request) -> list[dict]:
         ):
             try:
                 response = requests.get(
-                    f"{request.app.state.config.TTS_OPENAI_API_BASE_URL}/audio/models"
+                    f"{request.app.state.config.TTS_OPENAI_API_BASE_URL}/audio/models",
+                    headers={
+                        "Authorization": f"Bearer {request.app.state.config.TTS_OPENAI_API_KEY}",
+                    },
                 )
                 response.raise_for_status()
                 data = response.json()
@@ -1070,7 +1073,10 @@ def get_available_voices(request) -> dict:
         ):
             try:
                 response = requests.get(
-                    f"{request.app.state.config.TTS_OPENAI_API_BASE_URL}/audio/voices"
+                    f"{request.app.state.config.TTS_OPENAI_API_BASE_URL}/audio/voices",
+                    headers={
+                        "Authorization": f"Bearer {request.app.state.config.TTS_OPENAI_API_KEY}",
+                    },
                 )
                 response.raise_for_status()
                 data = response.json()