diff --git a/beast/asio/abstract_socket.h b/beast/asio/abstract_socket.h
index ec3c5cbcdd..ef2b1dba9c 100644
--- a/beast/asio/abstract_socket.h
+++ b/beast/asio/abstract_socket.h
@@ -22,7 +22,7 @@
 
 #include <beast/asio/buffer_sequence.h>
 #include <beast/asio/shared_handler.h>
-
+#include <boost/asio/io_service.hpp>
 #include <boost/asio/socket_base.hpp>
 #include <boost/asio/ssl/stream_base.hpp>
 
diff --git a/beast/module/asio/protocol/InputParser.h b/beast/module/asio/protocol/InputParser.h
index a1323468f7..2e6117a77a 100644
--- a/beast/module/asio/protocol/InputParser.h
+++ b/beast/module/asio/protocol/InputParser.h
@@ -21,6 +21,9 @@
 #define BEAST_ASIO_HANDSHAKE_INPUTPARSER_H_INCLUDED
 
 #include <beast/module/asio/basics/FixedInputBuffer.h>
+#include <beast/strings/String.h>
+
+#include <cctype>
 
 namespace beast {
 namespace asio {