diff --git a/beast/asio/bind_handler.h b/beast/asio/bind_handler.h
index 778b3723..968fb862 100644
--- a/beast/asio/bind_handler.h
+++ b/beast/asio/bind_handler.h
@@ -56,6 +56,7 @@ private:
 public:
     typedef void result_type;
 
+    explicit
     bound_handler (DeducedHandler&& handler, Args&&... args)
         : m_handler (std::forward <DeducedHandler> (handler))
         , m_args (std::forward <Args> (args)...)
diff --git a/beast/module/asio/basics/SSLContext.h b/beast/module/asio/basics/SSLContext.h
index 847927cb..8310914a 100644
--- a/beast/module/asio/basics/SSLContext.h
+++ b/beast/module/asio/basics/SSLContext.h
@@ -20,6 +20,7 @@
 #ifndef BEAST_ASIO_BASICS_SSLCONTEXT_H_INCLUDED
 #define BEAST_ASIO_BASICS_SSLCONTEXT_H_INCLUDED
 
+#include <beast/Uncopyable.h>
 #include <boost/asio/ssl/context.hpp>
 
 namespace beast {
diff --git a/beast/module/asio/basics/SharedArg.h b/beast/module/asio/basics/SharedArg.h
index cac7e86f..7e216362 100644
--- a/beast/module/asio/basics/SharedArg.h
+++ b/beast/module/asio/basics/SharedArg.h
@@ -20,6 +20,8 @@
 #ifndef BEAST_ASIO_SHAREDARG_H_INCLUDED
 #define BEAST_ASIO_SHAREDARG_H_INCLUDED
 
+#include <beast/smart_ptr/SharedPtr.h>
+
 namespace beast {
 namespace asio {