diff --git a/cpukit/rtems/src/msgqsend.c b/cpukit/rtems/src/msgqsend.c
index c7f72145b1..7d2c8af840 100644
--- a/cpukit/rtems/src/msgqsend.c
+++ b/cpukit/rtems/src/msgqsend.c
@@ -54,7 +54,7 @@
 rtems_status_code rtems_message_queue_send(
   Objects_Id            id,
   void                 *buffer,
-  uint32_t              size
+  size_t                size
 )
 {
   return( _Message_queue_Submit(id, buffer, size, MESSAGE_QUEUE_SEND_REQUEST) );
diff --git a/cpukit/rtems/src/msgqurgent.c b/cpukit/rtems/src/msgqurgent.c
index 8a5de65265..9247f89930 100644
--- a/cpukit/rtems/src/msgqurgent.c
+++ b/cpukit/rtems/src/msgqurgent.c
@@ -54,7 +54,7 @@
 rtems_status_code rtems_message_queue_urgent(
   Objects_Id            id,
   void                 *buffer,
-  uint32_t              size
+  size_t                size
 )
 {
   return(_Message_queue_Submit(id, buffer, size, MESSAGE_QUEUE_URGENT_REQUEST));