diff --git a/ui/ui-qmp-cmds.c b/ui/ui-qmp-cmds.c
index d772e1cb7f..74fa6c6ec5 100644
--- a/ui/ui-qmp-cmds.c
+++ b/ui/ui-qmp-cmds.c
@@ -44,7 +44,8 @@ void qmp_set_password(SetPasswordOptions *opts, Error **errp)
         assert(opts->protocol == DISPLAY_PROTOCOL_VNC);
         if (opts->connected != SET_PASSWORD_ACTION_KEEP) {
             /* vnc supports "connected=keep" only */
-            error_setg(errp, QERR_INVALID_PARAMETER, "connected");
+            error_setg(errp, "parameter 'connected' must be 'keep'"
+                       " when 'protocol' is 'vnc'");
             return;
         }
         /*
@@ -195,7 +196,7 @@ void qmp_client_migrate_info(const char *protocol, const char *hostname,
         }
 
         if (!has_port && !has_tls_port) {
-            error_setg(errp, QERR_MISSING_PARAMETER, "port/tls-port");
+            error_setg(errp, "parameter 'port' or 'tls-port' is required");
             return;
         }