diff --git a/src/inspect_ai/model/_providers/mistral.py b/src/inspect_ai/model/_providers/mistral.py
index c34d34eca..d66d1f827 100644
--- a/src/inspect_ai/model/_providers/mistral.py
+++ b/src/inspect_ai/model/_providers/mistral.py
@@ -3,7 +3,6 @@
 from typing import Any
 
 from mistralai import (
-    ChatCompletionRequestToolChoice,
     FunctionCall,
     FunctionName,
     Mistral,
@@ -179,11 +178,11 @@ def mistral_chat_tools(tools: list[ToolInfo]) -> list[MistralTool]:
 
 def mistral_chat_tool_choice(
     tool_choice: ToolChoice,
-) -> ChatCompletionRequestToolChoice:
+) -> str | dict[str, Any]:
     if isinstance(tool_choice, ToolFunction):
         return MistralToolChoice(
             type="function", function=FunctionName(name=tool_choice.name)
-        )
+        ).model_dump()
     elif tool_choice == "any":
         return "any"
     elif tool_choice == "auto":
diff --git a/tests/tools/test_tools.py b/tests/tools/test_tools.py
index 6c5289840..f30bf5b02 100644
--- a/tests/tools/test_tools.py
+++ b/tests/tools/test_tools.py
@@ -77,7 +77,9 @@ async def add(x: int, y: int):
     return add
 
 
-def check_tools(model: Model, disable: list[str] = ["calls", "force", "none"]) -> None:
+def check_tools(
+    model: Model, disable: list[Literal["calls", "force", "none"]] = []
+) -> None:
     if "calls" not in disable:
         check_tools_calls(model)
     if "force" not in disable:
@@ -171,7 +173,7 @@ def test_anthropic_tools():
 
 @skip_if_no_mistral
 def test_mistral_tools():
-    check_tools("mistral/mistral-large-latest", disable=["force"])
+    check_tools("mistral/mistral-large-latest")
 
 
 @skip_if_no_groq