diff --git a/test/std/localization/locale.categories/category.collate/locale.collate.byname/transform.pass.cpp b/test/std/localization/locale.categories/category.collate/locale.collate.byname/transform.pass.cpp
index 89714123..04cc060a 100644
--- a/test/std/localization/locale.categories/category.collate/locale.collate.byname/transform.pass.cpp
+++ b/test/std/localization/locale.categories/category.collate/locale.collate.byname/transform.pass.cpp
@@ -26,7 +26,7 @@
 int main()
 {
     // Ensure that the default locale is not C.  If it is, the second tests will fail.
-    putenv(const_cast<char*>("LANG=" LOCALE_en_US_UTF_8));
+    putenv(const_cast<char*>("LC_COLLATE=" LOCALE_en_US_UTF_8));
     {
         std::locale l(LOCALE_en_US_UTF_8);
         {