diff --git a/monitor.c b/monitor.c
index 2ff1e0b4d6..8946a100c0 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4157,6 +4157,9 @@ static int check_client_args_type(const QDict *client_args,
         case 'O':
             assert(flags & QMP_ACCEPT_UNKNOWNS);
             break;
+        case 'q':
+            /* Any QObject can be passed.  */
+            break;
         case '/':
         case '.':
             /*
diff --git a/qmp-commands.hx b/qmp-commands.hx
index c626ba8d3d..944787161f 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -708,7 +708,7 @@ EQMP
     },
     {
         .name       = "transaction",
-        .args_type  = "actions:O",
+        .args_type  = "actions:q",
         .mhandler.cmd_new = qmp_marshal_input_transaction,
     },
 
@@ -2125,7 +2125,7 @@ EQMP
 
     {
         .name       = "qom-set",
-	.args_type  = "path:s,property:s,opts:O",
+	.args_type  = "path:s,property:s,value:q",
 	.mhandler.cmd_new = qmp_qom_set,
     },