diff --git a/Lib/test/test_build_details.py b/Lib/test/test_build_details.py
index 30d9c213077ab7..141e361c2f78a7 100644
--- a/Lib/test/test_build_details.py
+++ b/Lib/test/test_build_details.py
@@ -130,7 +130,7 @@ def location(self):
                 dirname = os.path.join(projectdir, f.read())
         else:
             dirname = sysconfig.get_path('stdlib')
-        return os.path.join(dirname, 'build-details.json')
+        return os.path.join(dirname, sysconfig.get_config_var('BUILD_DETAILS'))
 
     @property
     def contents(self):