diff --git a/example/asio-example.cpp b/example/asio-example.cpp
index f7f0522..22ae70b 100644
--- a/example/asio-example.cpp
+++ b/example/asio-example.cpp
@@ -373,19 +373,19 @@
 
     // set up a client to make an async call to the server
     // using coroutines (userspace cooperative multitasking)
-    boost::asio::spawn(
+    (void)boost::asio::spawn(
         io,
         [conn](boost::asio::yield_context yield) {
             do_start_async_method_call_one(conn, yield);
         },
         boost::asio::detached);
-    boost::asio::spawn(
+    (void)boost::asio::spawn(
         io,
         [conn](boost::asio::yield_context yield) {
             do_start_async_ipmi_call(conn, yield);
         },
         boost::asio::detached);
-    boost::asio::spawn(
+    (void)boost::asio::spawn(
         io,
         [conn](boost::asio::yield_context yield) {
             do_start_async_to_yield(conn, yield);