diff --git a/libcxx/include/__memory/allocator_arg_t.h b/libcxx/include/__memory/allocator_arg_t.h
index 053af24b9fd6d..f5a116dbbd7e9 100644
--- a/libcxx/include/__memory/allocator_arg_t.h
+++ b/libcxx/include/__memory/allocator_arg_t.h
@@ -7,8 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef _LIBCPP___FUNCTIONAL___ALLOCATOR_ARG_T_H
-#define _LIBCPP___FUNCTIONAL___ALLOCATOR_ARG_T_H
+#ifndef _LIBCPP___FUNCTIONAL_ALLOCATOR_ARG_T_H
+#define _LIBCPP___FUNCTIONAL_ALLOCATOR_ARG_T_H
 
 #include <__config>
 #include <__memory/uses_allocator.h>
@@ -75,4 +75,4 @@ void __user_alloc_construct_impl (integral_constant<int, 2>, _Tp *__storage, con
 
 _LIBCPP_END_NAMESPACE_STD
 
-#endif // _LIBCPP___FUNCTIONAL___ALLOCATOR_ARG_T_H
+#endif // _LIBCPP___FUNCTIONAL_ALLOCATOR_ARG_T_H