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-rw-r--r--include/__functional_base2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/__functional_base b/include/__functional_base
index 9587d7ab15a1..ca761c409b62 100644
--- a/include/__functional_base
+++ b/include/__functional_base
@@ -558,7 +558,7 @@ struct __is_transparent<_Tp, _Up,
// allocator_arg_t
-struct _LIBCPP_TEMPLATE_VIS allocator_arg_t { };
+struct _LIBCPP_TEMPLATE_VIS allocator_arg_t { explicit allocator_arg_t() = default; };
#if defined(_LIBCPP_CXX03_LANG) || defined(_LIBCPP_BUILDING_LIBRARY)
extern _LIBCPP_EXPORTED_FROM_ABI const allocator_arg_t allocator_arg;