diff --git a/include/libtorrent/aux_/aligned_storage.hpp b/include/libtorrent/aux_/aligned_storage.hpp
index 53df74427..20733cb4e 100644
--- a/include/libtorrent/aux_/aligned_storage.hpp
+++ b/include/libtorrent/aux_/aligned_storage.hpp
@@ -37,7 +37,7 @@ POSSIBILITY OF SUCH DAMAGE.
 
 namespace libtorrent { namespace aux {
 
-#if defined __GNUC__ && __GNUC__ < 5
+#if defined __GNUC__ && __GNUC__ < 5 && !defined(_LIBCPP_VERSION)
 
 // this is for backwards compatibility with not-quite C++11 compilers
 template <std::size_t Len, std::size_t Align = alignof(void*)>
diff --git a/include/libtorrent/aux_/aligned_union.hpp b/include/libtorrent/aux_/aligned_union.hpp
index 7437c6c32..14ee3bac6 100644
--- a/include/libtorrent/aux_/aligned_union.hpp
+++ b/include/libtorrent/aux_/aligned_union.hpp
@@ -37,7 +37,7 @@ POSSIBILITY OF SUCH DAMAGE.
 
 namespace libtorrent { namespace aux {
 
-#if defined __GNUC__ && __GNUC__ < 5
+#if defined __GNUC__ && __GNUC__ < 5 && !defined(_LIBCPP_VERSION)
 
 constexpr std::size_t max(std::size_t a)
 { return a; }