diff --git a/test/beast/http/deferred.cpp b/test/beast/http/deferred.cpp
index c0d67040..9fcf491c 100644
--- a/test/beast/http/deferred.cpp
+++ b/test/beast/http/deferred.cpp
@@ -22,15 +22,15 @@ void test_deferred_for_http(
     http::serializer<true, http::empty_body> & ser,
     http::message<false, http::empty_body> & msg)
 {
-  http::async_read(stream, buf, parser, asio::deferred);
-  http::async_read(stream, buf, msg, asio::deferred);
-  http::async_read_some(stream, buf, parser, asio::deferred);
-  http::async_read_header(stream, buf, parser, asio::deferred);
+  (void)http::async_read(stream, buf, parser, asio::deferred);
+  (void)http::async_read(stream, buf, msg, asio::deferred);
+  (void)http::async_read_some(stream, buf, parser, asio::deferred);
+  (void)http::async_read_header(stream, buf, parser, asio::deferred);
 
-  http::async_write(stream, ser, asio::deferred);
-  http::async_write(stream, msg, asio::deferred);
-  http::async_write_header(stream, ser, asio::deferred);
-  http::async_write_some(stream, ser, asio::deferred);
+  (void)http::async_write(stream, ser, asio::deferred);
+  (void)http::async_write(stream, msg, asio::deferred);
+  (void)http::async_write_header(stream, ser, asio::deferred);
+  (void)http::async_write_some(stream, ser, asio::deferred);
 }
 
 #endif
diff --git a/test/beast/websocket/deferred.cpp b/test/beast/websocket/deferred.cpp
index cffe4f08..b90cabba 100644
--- a/test/beast/websocket/deferred.cpp
+++ b/test/beast/websocket/deferred.cpp
@@ -21,23 +21,22 @@ void test_deferred_for_websocket(
     beast::http::request<beast::http::empty_body> & req,
     websocket::response_type & res)
 {
-  stream.async_accept(asio::deferred);
-  stream.async_accept(asio::const_buffer(), asio::deferred);
-  stream.async_accept(req, asio::deferred);
-  stream.async_close(websocket::close_code::bad_payload, asio::deferred);
+  (void)stream.async_accept(asio::deferred);
+  (void)stream.async_accept(asio::const_buffer(), asio::deferred);
+  (void)stream.async_accept(req, asio::deferred);
+  (void)stream.async_close(websocket::close_code::bad_payload, asio::deferred);
 
-  stream.async_handshake("", "/", asio::deferred);
-  stream.async_handshake(res, "", "/", asio::deferred);
+  (void)stream.async_handshake("", "/", asio::deferred);
+  (void)stream.async_handshake(res, "", "/", asio::deferred);
 
-  stream.async_ping(websocket::ping_data{}, asio::deferred);
-  stream.async_pong(websocket::ping_data{}, asio::deferred);
+  (void)stream.async_ping(websocket::ping_data{}, asio::deferred);
+  (void)stream.async_pong(websocket::ping_data{}, asio::deferred);
 
-  stream.async_read(buf, asio::deferred);
-  stream.async_read_some(buf.data(), asio::deferred);
-
-  stream.async_write(buf.cdata(), asio::deferred);
-  stream.async_write_some(true, buf.cdata(), asio::deferred);
+  (void)stream.async_read(buf, asio::deferred);
+  (void)stream.async_read_some(buf.data(), asio::deferred);
 
+  (void)stream.async_write(buf.cdata(), asio::deferred);
+  (void)stream.async_write_some(true, buf.cdata(), asio::deferred);
 }
 
 #endif