diff --git a/homeassistant/components/ollama/entity.py b/homeassistant/components/ollama/entity.py
index 2b756d334308..b3c2d2d795be 100644
--- a/homeassistant/components/ollama/entity.py
+++ b/homeassistant/components/ollama/entity.py
@@ -94,7 +94,12 @@ def _convert_content(
     if isinstance(chat_content, conversation.ToolResultContent):
         return ollama.Message(
             role=MessageRole.TOOL.value,
-            content=json_dumps(chat_content.tool_result),
+            content=json_dumps(
+                {
+                    "data": chat_content.result.data,
+                    "error": chat_content.result.error,
+                }
+            ),
         )
     if isinstance(chat_content, conversation.AssistantContent):
         return ollama.Message(
diff --git a/tests/components/ollama/test_conversation.py b/tests/components/ollama/test_conversation.py
index acfded42862a..6a365d9a17c1 100644
--- a/tests/components/ollama/test_conversation.py
+++ b/tests/components/ollama/test_conversation.py
@@ -552,11 +552,12 @@ async def test_history_conversion(
             Message(
                 role="tool",
                 content=(
-                    '{"speech":{"plain":{"speech":"4:24 PM",'
+                    '{"data":{"speech":{"plain":{"speech":"4:24 PM",'
                     '"extra_data":null}},'
                     '"response_type":"action_done",'
                     '"speech_slots":{"time":"16:24:17.813343"},'
-                    '"data":{"success":[],"failed":[]}}'
+                    '"data":{"success":[],"failed":[]}},'
+                    '"error":false}'
                 ),
             ),
             Message(role="assistant", content="4:24 PM"),