diff --git a/src/buildtools/third_party/libc++/__assertion_handler b/src/buildtools/third_party/libc++/__assertion_handler
index 275d562532..b01d16d00b 100644
--- a/src/buildtools/third_party/libc++/__assertion_handler
+++ b/src/buildtools/third_party/libc++/__assertion_handler
@@ -29,7 +29,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 _LIBCPP_END_NAMESPACE_STD
 
 // TODO(hardening): use `__builtin_verbose_trap(message)` once that becomes available.
-#  define _LIBCPP_ASSERTION_HANDLER(message) ((void)message, __libcpp_hardening_failure())
+#  define _LIBCPP_ASSERTION_HANDLER(message) ((void)message, std::__libcpp_hardening_failure())
 
 #else