diff --git a/drivers/fbd/fbd.c b/drivers/fbd/fbd.c
index 5ffe9a365..40eb3527e 100644
--- a/drivers/fbd/fbd.c
+++ b/drivers/fbd/fbd.c
@@ -159,7 +159,7 @@ static int fbd_open(devminor_t UNUSED(minor), int access)
 	if (m.m_type != BDEV_REPLY)
 		panic("invalid reply from driver (%d)\n", m.m_type);
 
-	return m.BDEV_STATUS;
+	return m.m_lblockdriver_lbdev_reply.status;
 }
 
 /*===========================================================================*
@@ -183,7 +183,7 @@ static int fbd_close(devminor_t UNUSED(minor))
 	if (m.m_type != BDEV_REPLY)
 		panic("invalid reply from driver (%d)\n", m.m_type);
 
-	return m.BDEV_STATUS;
+	return m.m_lblockdriver_lbdev_reply.status;
 }
 
 /*===========================================================================*
@@ -226,7 +226,7 @@ static int fbd_ioctl(devminor_t UNUSED(minor), unsigned long request,
 
 	cpf_revoke(gid);
 
-	return m.BDEV_STATUS;
+	return m.m_lblockdriver_lbdev_reply.status;
 }
 
 /*===========================================================================*
@@ -271,7 +271,7 @@ static ssize_t fbd_transfer_direct(int do_write, u64_t position,
 	for (i = 0; i < count; i++)
 		cpf_revoke(iovec[i].iov_grant);
 
-	return m.BDEV_STATUS;
+	return m.m_lblockdriver_lbdev_reply.status;
 }
 
 /*===========================================================================*
@@ -369,7 +369,7 @@ static ssize_t fbd_transfer_copy(int do_write, u64_t position,
 		rule_io_hook(ptr, size, position, FBD_FLAG_READ);
 
 		/* Upon success, copy back whatever has been processed. */
-		rsize = m.BDEV_STATUS;
+		rsize = m.m_lblockdriver_lbdev_reply.status;
 		for (i = j = off = 0; rsize > 0 && i < count; i++) {
 			len = MIN(rsize, iov[i].iov_size);
 
@@ -392,7 +392,7 @@ static ssize_t fbd_transfer_copy(int do_write, u64_t position,
 	if (ptr != fbd_buf)
 		free_contig(ptr, size);
 
-	return m.BDEV_STATUS;
+	return m.m_lblockdriver_lbdev_reply.status;
 }
 
 /*===========================================================================*
diff --git a/drivers/filter/driver.c b/drivers/filter/driver.c
index e4cf2128f..be0e9c460 100644
--- a/drivers/filter/driver.c
+++ b/drivers/filter/driver.c
@@ -42,9 +42,10 @@ static int driver_open(int which)
 		return RET_REDO;
 	}
 
-	if(msg.m_type != BDEV_REPLY || msg.BDEV_STATUS != OK) {
+	if(msg.m_type != BDEV_REPLY ||
+		msg.m_lblockdriver_lbdev_reply.status != OK) {
 		printf("Filter: driver_open: ipc_sendrec returned %d, %d\n",
-			msg.m_type, msg.BDEV_STATUS);
+			msg.m_type, msg.m_lblockdriver_lbdev_reply.status);
 
 		return RET_REDO;
 	}
@@ -67,7 +68,8 @@ static int driver_open(int which)
 
 	cpf_revoke(gid);
 
-	if (r != OK || msg.m_type != BDEV_REPLY || msg.BDEV_STATUS != OK) {
+	if (r != OK || msg.m_type != BDEV_REPLY ||
+		msg.m_lblockdriver_lbdev_reply.status != OK) {
 		/* Not sure what to do here, either. */
 		printf("Filter: ioctl(DIOCGETP) returned (%d, %d)\n", 
 			r, msg.m_type);
@@ -122,9 +124,10 @@ static int driver_close(int which)
 		return RET_REDO;
 	}
 
-	if(msg.m_type != BDEV_REPLY || msg.BDEV_STATUS != OK) {
+	if(msg.m_type != BDEV_REPLY ||
+		msg.m_lblockdriver_lbdev_reply.status != OK) {
 		printf("Filter: driver_close: ipc_sendrec returned %d, %d\n",
-			msg.m_type, msg.BDEV_STATUS);
+			msg.m_type, msg.m_lblockdriver_lbdev_reply.status);
 
 		return RET_REDO;
 	}
@@ -938,52 +941,60 @@ int read_write(u64_t pos, char *bufa, char *bufb, size_t *sizep, int request)
 		return r;
 	}
 
-	if (m1.m_type != BDEV_REPLY || m1.BDEV_STATUS < 0) {
+	if (m1.m_type != BDEV_REPLY ||
+		m1.m_lblockdriver_lbdev_reply.status < 0) {
 		printf("Filter: unexpected/invalid reply from main driver: "
-			"(%x, %d)\n", m1.m_type, m1.BDEV_STATUS);
+			"(%x, %d)\n", m1.m_type,
+			m1.m_lblockdriver_lbdev_reply.status);
 
 		return bad_driver(DRIVER_MAIN, BD_PROTO,
-			(m1.m_type == BDEV_REPLY) ? m1.BDEV_STATUS : EFAULT);
+			(m1.m_type == BDEV_REPLY) ?
+			m1.m_lblockdriver_lbdev_reply.status : EFAULT);
 	}
 
-	if (m1.BDEV_STATUS != (ssize_t) *sizep) {
+	if (m1.m_lblockdriver_lbdev_reply.status != (ssize_t) *sizep) {
 		printf("Filter: truncated reply from main driver\n");
 
 		/* If the driver returned a value *larger* than we requested,
 		 * OR if we did NOT exceed the disk size, then we should
 		 * report the driver for acting strangely!
 		 */
-		if (m1.BDEV_STATUS > (ssize_t) *sizep ||
-			(pos + (unsigned int) m1.BDEV_STATUS < disk_size))
+		if (m1.m_lblockdriver_lbdev_reply.status > (ssize_t) *sizep ||
+			(pos + (unsigned int)
+			    m1.m_lblockdriver_lbdev_reply.status < disk_size))
 			return bad_driver(DRIVER_MAIN, BD_PROTO, EFAULT);
 
 		/* Return the actual size. */
-		*sizep = m1.BDEV_STATUS;
+		*sizep = m1.m_lblockdriver_lbdev_reply.status;
 	}
 
 	if (both) {
-		if (m2.m_type != BDEV_REPLY || m2.BDEV_STATUS < 0) {
+		if (m2.m_type != BDEV_REPLY ||
+			m2.m_lblockdriver_lbdev_reply.status < 0) {
 			printf("Filter: unexpected/invalid reply from "
 				"backup driver (%x, %d)\n",
-				m2.m_type, m2.BDEV_STATUS);
+				m2.m_type,
+				m2.m_lblockdriver_lbdev_reply.status);
 
 			return bad_driver(DRIVER_BACKUP, BD_PROTO,
-				m2.m_type == BDEV_REPLY ? m2.BDEV_STATUS :
+				m2.m_type == BDEV_REPLY ?
+				m2.m_lblockdriver_lbdev_reply.status :
 				EFAULT);
 		}
-		if (m2.BDEV_STATUS != (ssize_t) *sizep) {
+		if (m2.m_lblockdriver_lbdev_reply.status != (ssize_t) *sizep) {
 			printf("Filter: truncated reply from backup driver\n");
 
 			/* As above */
-			if (m2.BDEV_STATUS > (ssize_t) *sizep ||
-					(pos + (unsigned int) m2.BDEV_STATUS <
-					disk_size))
+			if (m2.m_lblockdriver_lbdev_reply.status > (ssize_t) *sizep ||
+					(pos + (unsigned int)
+					 m2.m_lblockdriver_lbdev_reply.status
+						< disk_size))
 				return bad_driver(DRIVER_BACKUP, BD_PROTO,
 					EFAULT);
 
 			/* Return the actual size. */
-			if ((ssize_t) *sizep >= m2.BDEV_STATUS)
-				*sizep = m2.BDEV_STATUS;
+			if ((ssize_t)*sizep >= m2.m_lblockdriver_lbdev_reply.status)
+				*sizep = m2.m_lblockdriver_lbdev_reply.status;
 		}
 	}
 
diff --git a/include/minix/com.h b/include/minix/com.h
index e4d9da24f..7756c58b3 100644
--- a/include/minix/com.h
+++ b/include/minix/com.h
@@ -928,7 +928,6 @@
 
 /* Field names for block device messages. */
 #define BDEV_MINOR	m10_i1	/* minor device number */
-#define BDEV_STATUS	m10_i1	/* OK or error code */
 #define BDEV_ACCESS	m10_i2	/* access bits for open requests */
 #define BDEV_COUNT	m10_i2	/* number of bytes or elements in transfer */
 #define BDEV_GRANT	m10_i3	/* grant ID of buffer or vector */
diff --git a/include/minix/ipc.h b/include/minix/ipc.h
index 4de52c274..7b1667e0a 100644
--- a/include/minix/ipc.h
+++ b/include/minix/ipc.h
@@ -124,6 +124,14 @@ typedef struct {
 } mess_lsys_krn_readbios;
 _ASSERT_MSG_SIZE(mess_lsys_krn_readbios);
 
+typedef struct {
+	int status;
+	int id;
+
+	uint8_t padding[48];
+} mess_lblockdriver_lbdev_reply;
+_ASSERT_MSG_SIZE(mess_lblockdriver_lbdev_reply);
+
 typedef struct {
 	int action;
 	int freq;
@@ -2032,6 +2040,7 @@ typedef struct {
 		mess_notify		m_notify;
 		mess_sigcalls		m_sigcalls;
 
+		mess_lblockdriver_lbdev_reply m_lblockdriver_lbdev_reply;
 		mess_lc_pm_cprof	m_lc_pm_cprof;
 		mess_lc_pm_sprof	m_lc_pm_sprof;
 		mess_lsys_krn_sys_diagctl m_lsys_krn_sys_diagctl;
diff --git a/lib/libbdev/ipc.c b/lib/libbdev/ipc.c
index ed92ebf7a..53ce3977c 100644
--- a/lib/libbdev/ipc.c
+++ b/lib/libbdev/ipc.c
@@ -185,8 +185,9 @@ int bdev_sendrec(dev_t dev, const message *m_orig)
   /* The protocol contract states that no asynchronous reply can satisfy a
    * synchronous SENDREC call, so we can never get an asynchronous reply here.
    */
-  if (m.BDEV_ID != NO_ID) {
-	printf("bdev: driver (%d) sent invalid ID (%ld)\n", endpt, m.BDEV_ID);
+  if (m.m_lblockdriver_lbdev_reply.id != NO_ID) {
+	printf("bdev: driver (%d) sent invalid ID (%d)\n", endpt,
+		m.m_lblockdriver_lbdev_reply.id);
 	return EINVAL;
   }
 
@@ -198,7 +199,7 @@ int bdev_sendrec(dev_t dev, const message *m_orig)
    * device, and then resend the request. If the call keeps failing, the caller
    * will eventually give up.
    */
-  if (m.BDEV_STATUS == ERESTART) {
+  if (m.m_lblockdriver_lbdev_reply.status == ERESTART) {
 	printf("bdev: got ERESTART from driver (%d), sleeping for reopen\n",
 		endpt);
 
@@ -208,7 +209,7 @@ int bdev_sendrec(dev_t dev, const message *m_orig)
   }
 
   /* Return the result of our request. */
-  return m.BDEV_STATUS;
+  return m.m_lblockdriver_lbdev_reply.status;
 }
 
 static int bdev_receive(dev_t dev, message *m)
@@ -278,11 +279,11 @@ void bdev_reply_asyn(message *m)
   assert(m->m_type == BDEV_REPLY);
 
   /* Get the corresponding asynchronous call structure. */
-  id = m->BDEV_ID;
+  id = m->m_lblockdriver_lbdev_reply.id;
 
   if ((call = bdev_call_get(id)) == NULL) {
-	printf("bdev: driver (%d) replied to unknown request (%ld)\n",
-		m->m_source, m->BDEV_ID);
+	printf("bdev: driver (%d) replied to unknown request (%d)\n",
+		m->m_source, m->m_lblockdriver_lbdev_reply.id);
 	return;
   }
 
@@ -298,7 +299,7 @@ void bdev_reply_asyn(message *m)
   }
 
   /* See the ERESTART comment in bdev_sendrec(). */
-  if (m->BDEV_STATUS == ERESTART) {
+  if (m->m_lblockdriver_lbdev_reply.status == ERESTART) {
 	printf("bdev: got ERESTART from driver (%d), sleeping for reopen\n",
 		endpt);
 
@@ -310,7 +311,7 @@ void bdev_reply_asyn(message *m)
 	return;
   }
 
-  bdev_callback_asyn(call, m->BDEV_STATUS);
+  bdev_callback_asyn(call, m->m_lblockdriver_lbdev_reply.status);
 }
 
 int bdev_wait_asyn(bdev_id_t id)
diff --git a/lib/libbdev/minor.c b/lib/libbdev/minor.c
index fc5af9817..4f1aeb74e 100644
--- a/lib/libbdev/minor.c
+++ b/lib/libbdev/minor.c
@@ -58,13 +58,13 @@ int bdev_minor_reopen(dev_t dev)
 			return EINVAL;
 		}
 
-		if (m.BDEV_ID != NO_ID) {
+		if (m.m_lblockdriver_lbdev_reply.id != NO_ID) {
 			printf("bdev: driver (%d) sent invalid ID (%ld)\n",
-				endpt, m.BDEV_ID);
+				endpt, m.m_lblockdriver_lbdev_reply.id);
 			return EINVAL;
 		}
 
-		if ((r = m.BDEV_STATUS) != OK) {
+		if ((r = m.m_lblockdriver_lbdev_reply.status) != OK) {
 			printf("bdev: driver (%d) failed device reopen (%d)\n",
 				endpt, r);
 			return r;
diff --git a/lib/libblockdriver/driver.c b/lib/libblockdriver/driver.c
index 55e716f49..fd55aa7c3 100644
--- a/lib/libblockdriver/driver.c
+++ b/lib/libblockdriver/driver.c
@@ -161,8 +161,8 @@ void blockdriver_reply(message *m_ptr, int ipc_status, int reply)
   memset(&m_reply, 0, sizeof(m_reply));
 
   m_reply.m_type = BDEV_REPLY;
-  m_reply.BDEV_STATUS = reply;
-  m_reply.BDEV_ID = m_ptr->BDEV_ID;
+  m_reply.m_lblockdriver_lbdev_reply.status = reply;
+  m_reply.m_lblockdriver_lbdev_reply.id = m_ptr->BDEV_ID;
 
   send_reply(m_ptr->m_source, &m_reply, ipc_status);
 }
diff --git a/lib/libchardriver/chardriver.c b/lib/libchardriver/chardriver.c
index 0890d5bf8..292eb4dcd 100644
--- a/lib/libchardriver/chardriver.c
+++ b/lib/libchardriver/chardriver.c
@@ -442,8 +442,8 @@ static void do_block_open(message *m_ptr, int ipc_status)
   memset(&m_reply, 0, sizeof(m_reply));
 
   m_reply.m_type = BDEV_REPLY;
-  m_reply.BDEV_STATUS = ENXIO;
-  m_reply.BDEV_ID = m_ptr->BDEV_ID;
+  m_reply.m_lblockdriver_lbdev_reply.status = ENXIO;
+  m_reply.m_lblockdriver_lbdev_reply.id = m_ptr->BDEV_ID;
 
   send_reply(m_ptr->m_source, &m_reply, ipc_status);
 }
diff --git a/servers/vfs/device.c b/servers/vfs/device.c
index d9ea8f29d..06eec3984 100644
--- a/servers/vfs/device.c
+++ b/servers/vfs/device.c
@@ -67,7 +67,7 @@ int bdev_open(dev_t dev, int access)
   if (r != OK)
 	return r;
 
-  return dev_mess.BDEV_STATUS;
+  return dev_mess.m_lblockdriver_lbdev_reply.status;
 }
 
 
@@ -96,7 +96,7 @@ int bdev_close(dev_t dev)
   if (r != OK)
 	return r;
 
-  return dev_mess.BDEV_STATUS;
+  return dev_mess.m_lblockdriver_lbdev_reply.status;
 }
 
 
@@ -147,7 +147,7 @@ static int bdev_ioctl(dev_t dev, endpoint_t proc_e, unsigned long req,
   if (r != OK)
 	return(r);
 
-  return(dev_mess.BDEV_STATUS);
+  return(dev_mess.m_lblockdriver_lbdev_reply.status);
 }
 
 
@@ -623,7 +623,7 @@ static int block_io(endpoint_t driver_e, message *mess_ptr)
 	if (r != OK)
 		return r;
 
-	status = mess_ptr->BDEV_STATUS;
+	status = mess_ptr->m_lblockdriver_lbdev_reply.status;
 	if (status == ERESTART) {
 		r = EDEADEPT;
 		*mess_ptr = mess_retry;
diff --git a/test/blocktest/blocktest.c b/test/blocktest/blocktest.c
index 14563185d..ffd9f3f98 100644
--- a/test/blocktest/blocktest.c
+++ b/test/blocktest/blocktest.c
@@ -279,12 +279,15 @@ static int sendrec_driver(message *m_ptr, ssize_t exp, result_t *res)
 	if (m_ptr->m_type != BDEV_REPLY)
 		return set_result(res, RESULT_BADTYPE, m_ptr->m_type);
 
-	if (m_ptr->BDEV_ID != m_orig.BDEV_ID)
-		return set_result(res, RESULT_BADID, m_ptr->BDEV_ID);
+	if (m_ptr->m_lblockdriver_lbdev_reply.id != m_orig.BDEV_ID)
+		return set_result(res, RESULT_BADID,
+				m_ptr->m_lblockdriver_lbdev_reply.id);
 
-	if ((exp < 0 && m_ptr->BDEV_STATUS >= 0) ||
-			(exp >= 0 && m_ptr->BDEV_STATUS < 0))
-		return set_result(res, RESULT_BADSTATUS, m_ptr->BDEV_STATUS);
+	if ((exp < 0 && m_ptr->m_lblockdriver_lbdev_reply.status >= 0) ||
+			(exp >= 0 &&
+			 m_ptr->m_lblockdriver_lbdev_reply.status < 0))
+		return set_result(res, RESULT_BADSTATUS,
+				m_ptr->m_lblockdriver_lbdev_reply.status);
 
 	return set_result(res, RESULT_OK, 0);
 }
@@ -321,13 +324,15 @@ static void raw_xfer(dev_t minor, u64_t pos, iovec_s_t *iovec, int nr_req,
 	if (r != RESULT_OK)
 		return;
 
-	if (m.BDEV_STATUS == exp)
+	if (m.m_lblockdriver_lbdev_reply.status == exp)
 		return;
 
 	if (exp < 0)
-		set_result(res, RESULT_BADSTATUS, m.BDEV_STATUS);
+		set_result(res, RESULT_BADSTATUS,
+			m.m_lblockdriver_lbdev_reply.status);
 	else
-		set_result(res, RESULT_TRUNC, exp - m.BDEV_STATUS);
+		set_result(res, RESULT_TRUNC,
+			exp - m.m_lblockdriver_lbdev_reply.status);
 }
 
 static void vir_xfer(dev_t minor, u64_t pos, iovec_t *iovec, int nr_req,
@@ -439,9 +444,10 @@ static void bad_read1(void)
 
 	sendrec_driver(&m, OK, &res);
 
-	if (res.type == RESULT_OK && m.BDEV_STATUS != (ssize_t) iov.iov_size) {
+	if (res.type == RESULT_OK &&
+		m.m_lblockdriver_lbdev_reply.status != (ssize_t) iov.iov_size) {
 		res.type = RESULT_TRUNC;
-		res.value = m.BDEV_STATUS;
+		res.value = m.m_lblockdriver_lbdev_reply.status;
 	}
 
 	got_result(&res, "normal request");
@@ -489,9 +495,10 @@ static void bad_read1(void)
 
 	sendrec_driver(&m, OK, &res);
 
-	if (res.type == RESULT_OK && m.BDEV_STATUS != (ssize_t) iov.iov_size) {
+	if (res.type == RESULT_OK &&
+		m.m_lblockdriver_lbdev_reply.status != (ssize_t) iov.iov_size) {
 		res.type = RESULT_TRUNC;
-		res.value = m.BDEV_STATUS;
+		res.value = m.m_lblockdriver_lbdev_reply.status;
 	}
 
 	got_result(&res, "normal request");