diff --git a/libcxx/test/std/input.output/filesystems/class.path/path.member/path.assign/source.pass.cpp b/libcxx/test/std/input.output/filesystems/class.path/path.member/path.assign/source.pass.cpp
index e02049821c115b..2ada91354b5180 100644
--- a/libcxx/test/std/input.output/filesystems/class.path/path.member/path.assign/source.pass.cpp
+++ b/libcxx/test/std/input.output/filesystems/class.path/path.member/path.assign/source.pass.cpp
@@ -223,7 +223,7 @@ void RunStringMoveTest(const char* Expect) {
   assert(p == Expect);
   {
     // Signature test
-    ASSERT_NOEXCEPT(p = std::move(ss));
+    LIBCPP_ONLY(ASSERT_NOEXCEPT(p = std::move(ss)));
   }
 }