diff --git a/libcxx/test/std/input.output/filesystems/class.path/path.member/path.append.pass.cpp b/libcxx/test/std/input.output/filesystems/class.path/path.member/path.append.pass.cpp
--- a/libcxx/test/std/input.output/filesystems/class.path/path.member/path.append.pass.cpp
+++ b/libcxx/test/std/input.output/filesystems/class.path/path.member/path.append.pass.cpp
@@ -330,6 +330,7 @@
     doAppendSourceTest<char32_t>(TC);
   }
   for (auto const & TC : LongLHSCases) {
+    (void)TC;
     LIBCPP_ONLY(doAppendSourceAllocTest<char>(TC));
     LIBCPP_ONLY(doAppendSourceAllocTest<wchar_t>(TC));
   }