diff --git a/libcxx/include/__split_buffer b/libcxx/include/__split_buffer
index eb78c9c4c0acca..7409b51b1f96b4 100644
--- a/libcxx/include/__split_buffer
+++ b/libcxx/include/__split_buffer
@@ -230,7 +230,7 @@ __split_buffer<_Tp, _Allocator>::__construct_at_end(size_type __n, const_referen
 
 template <class _Tp, class _Allocator>
 template <class _InputIter>
-__enable_if_t<__is_cpp17_input_iterator<_InputIter>::value && !__is_cpp17_forward_iterator<_InputIter>::value>
+__enable_if_t<__is_exactly_cpp17_input_iterator<_InputIter>::value>
 __split_buffer<_Tp, _Allocator>::__construct_at_end(_InputIter __first, _InputIter __last)
 {
     __alloc_rr& __a = this->__alloc();