diff --git a/compiler/cpp/src/generate/t_alterl_generator.cc b/compiler/cpp/src/generate/t_alterl_generator.cc
index cb4c1af..f3d661f 100644
--- a/compiler/cpp/src/generate/t_alterl_generator.cc
+++ b/compiler/cpp/src/generate/t_alterl_generator.cc
@@ -527,6 +527,8 @@
 
   if (!tfunction->get_returntype()->is_void())
     indent(f_service_) << generate_type_term(tfunction->get_returntype(), true) << ";" << endl;
+  else if (tfunction->is_async())
+    indent(f_service_) << "async_void;" << endl;
   else
     indent(f_service_) << "{struct, []}" << ";" << endl;
   indent_down();
@@ -537,13 +539,6 @@
   indent_up();
   indent(f_service_) << generate_type_term(xs, true) << ";" << endl;
   indent_down();
-
-  // function_info(Function, is_async):
-  indent(f_service_) <<
-    "function_info(" << name_atom << ", is_async) -> ";
-
-  f_service_ << ((tfunction->is_async()) ? "true" : "false");
-  f_service_ << ";" << endl;
 }
 
 
diff --git a/lib/alterl/src/thrift_processor.erl b/lib/alterl/src/thrift_processor.erl
index c3434cd..2b435ac 100644
--- a/lib/alterl/src/thrift_processor.erl
+++ b/lib/alterl/src/thrift_processor.erl
@@ -73,7 +73,11 @@
             ok = send_reply(OProto, Function, ?tMessageType_REPLY, Reply);
 
         ok when ReplyType == {struct, []} ->
-            ok = send_reply(OProto, Function, ?tMessageType_REPLY, {ReplyType, {StructName}})
+            ok = send_reply(OProto, Function, ?tMessageType_REPLY, {ReplyType, {StructName}});
+        
+        ok when ReplyType == async_void ->
+            % no reply for async void
+            ok
     end,
     ok.
 
diff --git a/test/erl/src/test_server.erl b/test/erl/src/test_server.erl
index 1bd0e1c..d44e902 100644
--- a/test/erl/src/test_server.erl
+++ b/test/erl/src/test_server.erl
@@ -148,4 +148,8 @@
                                     #xtruct{string_thing = "This is an Xception2"}});
         _ ->
             {reply, #xtruct{string_thing = Arg1}}
-    end.
+    end;
+
+handle_function(testAsync, {Seconds}) ->
+    timer:sleep(1000 * Seconds),
+    ok.