diff --git a/include/boost/container/detail/destroyers.hpp b/include/boost/container/detail/destroyers.hpp
index dc25c6d..52b44c0 100644
--- a/include/boost/container/detail/destroyers.hpp
+++ b/include/boost/container/detail/destroyers.hpp
@@ -311,7 +311,7 @@ class allocator_destroyer
    {  a_.deallocate_one(p); }
 
    public:
-   allocator_destroyer(Allocator &a)
+   explicit allocator_destroyer(Allocator &a)
       : a_(a)
    {}