diff --git a/router/src/lib.rs b/router/src/lib.rs
index 08f8924d073..7295a7a9388 100644
--- a/router/src/lib.rs
+++ b/router/src/lib.rs
@@ -1781,7 +1781,7 @@ mod tests {
             stop: None,
             stream: false,
             tools: tools,
-            tool_choice: None,
+            tool_choice: ToolChoice::Auto,
             tool_prompt: Some("Given the functions available, please respond with a JSON for a function call with its proper arguments that best answers the given prompt. Respond in the format {name: function name, parameters: dictionary of argument name and its value}.Do not use variables.".to_string()),
             temperature: None,
             response_format: None,