diff --git a/include/boost/asio/defer.hpp b/include/boost/asio/defer.hpp
index 8bf0477a..d9489e23 100644
--- a/include/boost/asio/defer.hpp
+++ b/include/boost/asio/defer.hpp
@@ -80,8 +80,8 @@ namespace asio {
  * @par Completion Signature
  * @code void() @endcode
  */
-template <BOOST_ASIO_COMPLETION_TOKEN_FOR(void()) NullaryToken>
-inline auto defer(NullaryToken&& token)
+template <BOOST_ASIO_COMPLETION_TOKEN_FOR(void()) NullaryToken = deferred_t>
+inline auto defer(NullaryToken&& token = deferred_t())
   -> decltype(
     async_initiate<NullaryToken, void()>(
       declval<detail::initiate_defer>(), token))
diff --git a/include/boost/asio/dispatch.hpp b/include/boost/asio/dispatch.hpp
index 62dcfef5..8e4d0960 100644
--- a/include/boost/asio/dispatch.hpp
+++ b/include/boost/asio/dispatch.hpp
@@ -70,8 +70,8 @@ namespace asio {
  * @par Completion Signature
  * @code void() @endcode
  */
-template <BOOST_ASIO_COMPLETION_TOKEN_FOR(void()) NullaryToken>
-inline auto dispatch(NullaryToken&& token)
+template <BOOST_ASIO_COMPLETION_TOKEN_FOR(void()) NullaryToken = deferred_t>
+inline auto dispatch(NullaryToken&& token = deferred_t())
   -> decltype(
     async_initiate<NullaryToken, void()>(
       declval<detail::initiate_dispatch>(), token))
diff --git a/include/boost/asio/post.hpp b/include/boost/asio/post.hpp
index 0ceadc05..c5f8cdc5 100644
--- a/include/boost/asio/post.hpp
+++ b/include/boost/asio/post.hpp
@@ -78,8 +78,8 @@ namespace asio {
  * @par Completion Signature
  * @code void() @endcode
  */
-template <BOOST_ASIO_COMPLETION_TOKEN_FOR(void()) NullaryToken>
-inline auto post(NullaryToken&& token)
+template <BOOST_ASIO_COMPLETION_TOKEN_FOR(void()) NullaryToken = deferred_t>
+inline auto post(NullaryToken&& token = deferred_t())
   -> decltype(
     async_initiate<NullaryToken, void()>(
       declval<detail::initiate_post>(), token))
diff --git a/test/defer.cpp b/test/defer.cpp
index 170ad3c2..579e12d7 100644
--- a/test/defer.cpp
+++ b/test/defer.cpp
@@ -16,6 +16,7 @@
 // Test that header file is self-contained.
 #include <boost/asio/defer.hpp>
 
+#include <boost/asio/bind_executor.hpp>
 #include <boost/asio/io_context.hpp>
 #include "unit_test.hpp"
 
@@ -95,6 +96,22 @@ void move_only_result_handler(
   *result_out = result_in.value();
 }
 
+void defer_no_args_test()
+{
+  io_context ctx(1);
+
+  int handler_count = 0;
+  boost::asio::defer(boost::asio::deferred)(
+      boost::asio::bind_executor(ctx,
+        bindns::bind(void_handler, &handler_count)));
+
+  BOOST_ASIO_CHECK(handler_count == 0);
+
+  ctx.run();
+
+  BOOST_ASIO_CHECK(handler_count == 1);
+}
+
 void defer_function_test()
 {
   io_context ctx(1);
@@ -229,5 +246,6 @@ void defer_function_test()
 BOOST_ASIO_TEST_SUITE
 (
   "defer",
+  BOOST_ASIO_TEST_CASE(defer_no_args_test)
   BOOST_ASIO_TEST_CASE(defer_function_test)
 )
diff --git a/test/dispatch.cpp b/test/dispatch.cpp
index 61336a13..57aff4e0 100644
--- a/test/dispatch.cpp
+++ b/test/dispatch.cpp
@@ -16,6 +16,7 @@
 // Test that header file is self-contained.
 #include <boost/asio/dispatch.hpp>
 
+#include <boost/asio/bind_executor.hpp>
 #include <boost/asio/io_context.hpp>
 #include "unit_test.hpp"
 
@@ -95,6 +96,22 @@ void move_only_result_handler(
   *result_out = result_in.value();
 }
 
+void dispatch_no_args_test()
+{
+  io_context ctx(1);
+
+  int handler_count = 0;
+  boost::asio::dispatch(boost::asio::deferred)(
+      boost::asio::bind_executor(ctx,
+        bindns::bind(void_handler, &handler_count)));
+
+  BOOST_ASIO_CHECK(handler_count == 0);
+
+  ctx.run();
+
+  BOOST_ASIO_CHECK(handler_count == 1);
+}
+
 void dispatch_function_test()
 {
   io_context ctx(1);
@@ -229,5 +246,6 @@ void dispatch_function_test()
 BOOST_ASIO_TEST_SUITE
 (
   "dispatch",
+  BOOST_ASIO_TEST_CASE(dispatch_no_args_test)
   BOOST_ASIO_TEST_CASE(dispatch_function_test)
 )
diff --git a/test/post.cpp b/test/post.cpp
index ea86795a..5c58dcff 100644
--- a/test/post.cpp
+++ b/test/post.cpp
@@ -16,6 +16,7 @@
 // Test that header file is self-contained.
 #include <boost/asio/post.hpp>
 
+#include <boost/asio/bind_executor.hpp>
 #include <boost/asio/io_context.hpp>
 #include "unit_test.hpp"
 
@@ -95,6 +96,22 @@ void move_only_result_handler(
   *result_out = result_in.value();
 }
 
+void post_no_args_test()
+{
+  io_context ctx(1);
+
+  int handler_count = 0;
+  boost::asio::post(boost::asio::deferred)(
+      boost::asio::bind_executor(ctx,
+        bindns::bind(void_handler, &handler_count)));
+
+  BOOST_ASIO_CHECK(handler_count == 0);
+
+  ctx.run();
+
+  BOOST_ASIO_CHECK(handler_count == 1);
+}
+
 void post_function_test()
 {
   io_context ctx(1);
@@ -229,5 +246,6 @@ void post_function_test()
 BOOST_ASIO_TEST_SUITE
 (
   "post",
+  BOOST_ASIO_TEST_CASE(post_no_args_test)
   BOOST_ASIO_TEST_CASE(post_function_test)
 )