diff --git a/homeassistant/components/esphome/assist_satellite.py b/homeassistant/components/esphome/assist_satellite.py
index fdeadd7feb1..f6367165400 100644
--- a/homeassistant/components/esphome/assist_satellite.py
+++ b/homeassistant/components/esphome/assist_satellite.py
@@ -285,9 +285,9 @@ class EsphomeAssistSatellite(
             data_to_send = {"text": event.data["stt_output"]["text"]}
         elif event_type == VoiceAssistantEventType.VOICE_ASSISTANT_INTENT_PROGRESS:
             data_to_send = {
-                "tts_start_streaming": bool(
-                    event.data and event.data.get("tts_start_streaming")
-                ),
+                "tts_start_streaming": "1"
+                if (event.data and event.data.get("tts_start_streaming"))
+                else "0",
             }
         elif event_type == VoiceAssistantEventType.VOICE_ASSISTANT_INTENT_END:
             assert event.data is not None
diff --git a/tests/components/esphome/test_assist_satellite.py b/tests/components/esphome/test_assist_satellite.py
index 71977f0285c..3acdc1f2029 100644
--- a/tests/components/esphome/test_assist_satellite.py
+++ b/tests/components/esphome/test_assist_satellite.py
@@ -243,12 +243,12 @@ async def test_pipeline_api_audio(
         event_callback(
             PipelineEvent(
                 type=PipelineEventType.INTENT_PROGRESS,
-                data={"tts_start_streaming": True},
+                data={"tts_start_streaming": "1"},
             )
         )
         assert mock_client.send_voice_assistant_event.call_args_list[-1].args == (
             VoiceAssistantEventType.VOICE_ASSISTANT_INTENT_PROGRESS,
-            {"tts_start_streaming": True},
+            {"tts_start_streaming": "1"},
         )
 
         event_callback(