diff --git a/hmp-commands.hx b/hmp-commands.hx
index dcec5efab78edd80a608dd7a2fdd05dc2ccf8bf2..45e1763fbe3c342838c4b7ec6aa61799f4021acb 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1359,6 +1359,7 @@ ETEXI
         .params     = "[reset|shutdown|poweroff|pause|debug|none]",
         .help       = "change watchdog action",
         .mhandler.cmd = do_watchdog_action,
+        .command_completion = watchdog_action_completion,
     },
 
 STEXI
diff --git a/hmp.h b/hmp.h
index 212e5d2ae60079fe425f254c8330de1c976dcbb2..a70804db46e0e6ea077bb1de4acb2c5067253d27 100644
--- a/hmp.h
+++ b/hmp.h
@@ -105,5 +105,7 @@ void netdev_add_completion(ReadLineState *rs, int nb_args, const char *str);
 void netdev_del_completion(ReadLineState *rs, int nb_args, const char *str);
 void ringbuf_write_completion(ReadLineState *rs, int nb_args, const char *str);
 void ringbuf_read_completion(ReadLineState *rs, int nb_args, const char *str);
+void watchdog_action_completion(ReadLineState *rs, int nb_args,
+                                const char *str);
 
 #endif
diff --git a/monitor.c b/monitor.c
index e539e40b832351ff9878e92dc6732afc560302bf..68d74cd351d51ba1d99e25b6930980e27eb2d961 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4559,6 +4559,20 @@ void netdev_del_completion(ReadLineState *rs, int nb_args, const char *str)
     }
 }
 
+void watchdog_action_completion(ReadLineState *rs, int nb_args, const char *str)
+{
+    if (nb_args != 2) {
+        return;
+    }
+    readline_set_completion_index(rs, strlen(str));
+    add_completion_option(rs, str, "reset");
+    add_completion_option(rs, str, "shutdown");
+    add_completion_option(rs, str, "poweroff");
+    add_completion_option(rs, str, "pause");
+    add_completion_option(rs, str, "debug");
+    add_completion_option(rs, str, "none");
+}
+
 static void monitor_find_completion_by_table(Monitor *mon,
                                              const mon_cmd_t *cmd_table,
                                              char **args,