diff --git a/sched/mqueue/mq_send.c b/sched/mqueue/mq_send.c
index 0df8c7b2b8..4ca49d54d5 100644
--- a/sched/mqueue/mq_send.c
+++ b/sched/mqueue/mq_send.c
@@ -216,7 +216,7 @@ int nxmq_send(mqd_t mqdes, FAR const char *msg, size_t msglen,
  *   EAGAIN   The queue was full and the O_NONBLOCK flag was set for the
  *            message queue description referred to by mqdes.
  *   EINVAL   Either msg or mqdes is NULL or the value of prio is invalid.
- *   EPERM    Message queue opened not opened for writing.
+ *   EBADF    Message queue opened not opened for writing.
  *   EMSGSIZE 'msglen' was greater than the maxmsgsize attribute of the
  *            message queue.
  *   EINTR    The call was interrupted by a signal handler.
diff --git a/sched/mqueue/mq_sndinternal.c b/sched/mqueue/mq_sndinternal.c
index fe0af476fb..eceff480e5 100644
--- a/sched/mqueue/mq_sndinternal.c
+++ b/sched/mqueue/mq_sndinternal.c
@@ -66,7 +66,7 @@
  *   returned.
  *
  *     EINVAL   Either msg or msgq is NULL or the value of prio is invalid.
- *     EPERM    Message queue opened not opened for writing.
+ *     EBADF    Message queue opened not opened for writing.
  *     EMSGSIZE 'msglen' was greater than the maxmsgsize attribute of the
  *               message queue.
  *
@@ -88,14 +88,14 @@ int nxmq_verify_send(FAR FAR struct file *mq, FAR const char *msg,
 
   /* Verify the input parameters */
 
-  if (msg == NULL || msgq == NULL || prio > MQ_PRIO_MAX)
+  if (msg == NULL || msgq == NULL || prio >= MQ_PRIO_MAX)
     {
       return -EINVAL;
     }
 
   if ((mq->f_oflags & O_WROK) == 0)
     {
-      return -EPERM;
+      return -EBADF;
     }
 
   if (msglen > (size_t)msgq->maxmsgsize)