diff --git a/tests/load_tests.cpp b/tests/load_tests.cpp
index 3a7556b57..b972f08d7 100644
--- a/tests/load_tests.cpp
+++ b/tests/load_tests.cpp
@@ -11,7 +11,7 @@
 using namespace mlx::core;
 
 std::string get_temp_file(const std::string& name) {
-  return std::filesystem::temp_directory_path().append(name);
+  return std::filesystem::temp_directory_path().append(name).string();
 }
 
 TEST_CASE("test save_safetensors") {