diff --git a/tests/src/make_test_data_available.hpp b/tests/src/make_test_data_available.hpp
index fca1c8da8..740c83927 100644
--- a/tests/src/make_test_data_available.hpp
+++ b/tests/src/make_test_data_available.hpp
@@ -11,7 +11,7 @@ namespace utils
 inline bool check_testsuite_downloaded()
 {
     std::unique_ptr<std::FILE, decltype(&std::fclose)> file(std::fopen(TEST_DATA_DIRECTORY "/README.md", "r"), &std::fclose);
-    return file.operator bool();
+    return file != nullptr;
 }
 
 TEST_CASE("check test suite is downloaded")