diff --git a/cpukit/posix/src/mqueuerecvsupp.c b/cpukit/posix/src/mqueuerecvsupp.c
index 6c2ca9e605..d97db51642 100644
--- a/cpukit/posix/src/mqueuerecvsupp.c
+++ b/cpukit/posix/src/mqueuerecvsupp.c
@@ -51,7 +51,7 @@ ssize_t _POSIX_Message_queue_Receive_support(
   POSIX_Message_queue_Control     *the_mq;
   POSIX_Message_queue_Control_fd  *the_mq_fd;
   Objects_Locations                location;
-  uint32_t                         length_out;
+  size_t                           length_out;
 
   the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location );
   switch ( location ) {
diff --git a/cpukit/rtems/src/msgqreceive.c b/cpukit/rtems/src/msgqreceive.c
index 649aed45dd..1803081339 100644
--- a/cpukit/rtems/src/msgqreceive.c
+++ b/cpukit/rtems/src/msgqreceive.c
@@ -56,7 +56,7 @@
 rtems_status_code rtems_message_queue_receive(
   Objects_Id            id,
   void                 *buffer,
-  uint32_t             *size,
+  size_t               *size,
   uint32_t              option_set,
   rtems_interval        timeout
 )