diff --git a/src/tests/main.cpp b/src/tests/main.cpp
index 85445fe3f9b..3321e47d431 100644
--- a/src/tests/main.cpp
+++ b/src/tests/main.cpp
@@ -61,7 +61,8 @@ std::ofstream reporter;
 struct wesnoth_global_fixture {
 	wesnoth_global_fixture()
 	{
-		using namespace boost::unit_test; using namespace std::literals;
+		using namespace boost::unit_test;
+		using namespace std::literals;
 		boost::filesystem::path file("boost_test_result.xml");
 		for(int i = 1; i < framework::master_test_suite().argc; i++) {
 			if(framework::master_test_suite().argv[i - 1] == "--output_file"s) {
@@ -70,7 +71,7 @@ struct wesnoth_global_fixture {
 			}
 		}
 
-		reporter.open(file.c_str());
+		reporter.open(file.string());
 		assert( reporter.is_open() );
 
 		results_reporter::set_stream(reporter);