diff --git a/monitor.c b/monitor.c
index 4c7faf9..8b1dbf8 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4016,7 +4016,7 @@
                 if (len <= 0) {
                     monitor_printf(mon, "%s: string expected\n",
                                    cmd->name);
-                    break;
+                    goto fail;
                 }
                 qdict_put(qdict, key, qstring_from_str(p));
                 p += len;