diff --git a/include/boost/unordered/detail/foa.hpp b/include/boost/unordered/detail/foa.hpp
index cf1ce6a7..ee53046c 100644
--- a/include/boost/unordered/detail/foa.hpp
+++ b/include/boost/unordered/detail/foa.hpp
@@ -1467,7 +1467,7 @@ private:
     return res;
   }
 
-#if 0
+#if 1
   template<typename... Args>
   iterator nosize_unchecked_emplace_at(
     const arrays_type& arrays_,std::size_t pos0,std::size_t hash,