diff --git a/include/minix/ipc.h b/include/minix/ipc.h
index f892cc647..f0715624d 100644
--- a/include/minix/ipc.h
+++ b/include/minix/ipc.h
@@ -162,6 +162,23 @@ typedef struct {
 } mess_fs_vfs_chmod;
 _ASSERT_MSG_SIZE(mess_fs_vfs_chmod);
 
+typedef struct {
+	ino_t inode;
+
+	uid_t uid;
+	gid_t gid;
+
+	uint8_t data[40];
+} mess_vfs_fs_chown;
+_ASSERT_MSG_SIZE(mess_vfs_fs_chown);
+
+typedef struct {
+	mode_t mode;
+
+	uint8_t data[52];
+} mess_fs_vfs_chown;
+_ASSERT_MSG_SIZE(mess_fs_vfs_chown);
+
 typedef struct {
 	ino_t inode;
 
@@ -532,6 +549,8 @@ typedef struct {
 	mess_fs_vfs_newnode m_fs_vfs_newnode;
 	mess_vfs_fs_chmod m_vfs_fs_chmod;
 	mess_fs_vfs_chmod m_fs_vfs_chmod;
+	mess_vfs_fs_chown m_vfs_fs_chown;
+	mess_fs_vfs_chown m_fs_vfs_chown;
 	mess_vfs_fs_create m_vfs_fs_create;
 	mess_fs_vfs_create m_fs_vfs_create;
 	mess_vfs_fs_flush m_vfs_fs_flush;
diff --git a/lib/libpuffs/protect.c b/lib/libpuffs/protect.c
index f75fea50d..6a127f513 100644
--- a/lib/libpuffs/protect.c
+++ b/lib/libpuffs/protect.c
@@ -54,14 +54,14 @@ int fs_chown(void)
   struct vattr va;
   PUFFS_MAKECRED(pcr, &global_kcred);
 
-  if ((pn = puffs_pn_nodewalk(global_pu, 0, &fs_m_in.REQ_INODE_NR)) == NULL)
+  if ((pn = puffs_pn_nodewalk(global_pu, 0, &fs_m_in.m_vfs_fs_chown.inode)) == NULL)
 	return(EINVAL);
 
   /* Not permitted to change the owner of a file on a read-only file sys. */
   if (!is_readonly_fs) {
 	puffs_vattr_null(&va);
-	va.va_uid = fs_m_in.REQ_UID;
-	va.va_gid = fs_m_in.REQ_GID;
+	va.va_uid = fs_m_in.m_vfs_fs_chown.uid;
+	va.va_gid = fs_m_in.m_vfs_fs_chown.gid;
 	va.va_mode = pn->pn_va.va_mode & ~(I_SET_UID_BIT | I_SET_GID_BIT);
 	va.va_ctime = clock_timespec();
 
@@ -70,7 +70,7 @@ int fs_chown(void)
   }
 
   /* Update caller on current mode, as it may have changed. */
-  fs_m_out.RES_MODE = pn->pn_va.va_mode;
+  fs_m_out.m_fs_vfs_chown.mode = pn->pn_va.va_mode;
 
   return(OK);
 }
diff --git a/servers/ext2/protect.c b/servers/ext2/protect.c
index 436e9d23c..d3e6315b0 100644
--- a/servers/ext2/protect.c
+++ b/servers/ext2/protect.c
@@ -48,21 +48,21 @@ int fs_chown()
   register int r;
 
   /* Temporarily open the file. */
-  if( (rip = get_inode(fs_dev, (pino_t) fs_m_in.REQ_INODE_NR)) == NULL)
+  if( (rip = get_inode(fs_dev, fs_m_in.m_vfs_fs_chown.inode)) == NULL)
 	  return(EINVAL);
 
   /* Not permitted to change the owner of a file on a read-only file sys. */
   r = read_only(rip);
   if (r == OK) {
-	  rip->i_uid = fs_m_in.REQ_UID;
-	  rip->i_gid = fs_m_in.REQ_GID;
+	  rip->i_uid = fs_m_in.m_vfs_fs_chown.uid;
+	  rip->i_gid = fs_m_in.m_vfs_fs_chown.gid;
 	  rip->i_mode &= ~(I_SET_UID_BIT | I_SET_GID_BIT);
 	  rip->i_update |= CTIME;
 	  rip->i_dirt = IN_DIRTY;
   }
 
   /* Update caller on current mode, as it may have changed. */
-  fs_m_out.RES_MODE = rip->i_mode;
+  fs_m_out.m_fs_vfs_chown.mode = rip->i_mode;
   put_inode(rip);
 
   return(r);
diff --git a/servers/mfs/protect.c b/servers/mfs/protect.c
index 85826e2d5..c17712852 100644
--- a/servers/mfs/protect.c
+++ b/servers/mfs/protect.c
@@ -49,21 +49,21 @@ int fs_chown()
   register int r;
 
   /* Temporarily open the file. */
-  if( (rip = get_inode(fs_dev, (pino_t) fs_m_in.REQ_INODE_NR)) == NULL)
+  if( (rip = get_inode(fs_dev, fs_m_in.m_vfs_fs_chown.inode)) == NULL)
 	  return(EINVAL);
 
   /* Not permitted to change the owner of a file on a read-only file sys. */
   r = read_only(rip);
   if (r == OK) {
-	  rip->i_uid = (uid_t) fs_m_in.REQ_UID;
-	  rip->i_gid = (gid_t) fs_m_in.REQ_GID;
+	  rip->i_uid = fs_m_in.m_vfs_fs_chown.uid;
+	  rip->i_gid = fs_m_in.m_vfs_fs_chown.gid;
 	  rip->i_mode &= ~(I_SET_UID_BIT | I_SET_GID_BIT);
 	  rip->i_update |= CTIME;
           IN_MARKDIRTY(rip);
   }
 
   /* Update caller on current mode, as it may have changed. */
-  fs_m_out.RES_MODE = rip->i_mode;
+  fs_m_out.m_fs_vfs_chown.mode = rip->i_mode;
   put_inode(rip);
   
   return(r);
diff --git a/servers/vfs/request.c b/servers/vfs/request.c
index 4c028f743..c93795b63 100644
--- a/servers/vfs/request.c
+++ b/servers/vfs/request.c
@@ -144,15 +144,15 @@ int req_chown(
 
   /* Fill in request message */
   m.m_type = REQ_CHOWN;
-  m.REQ_INODE_NR = (pino_t) inode_nr;
-  m.REQ_UID = (puid_t) newuid;
-  m.REQ_GID = (pgid_t) newgid;
+  m.m_vfs_fs_chown.inode = inode_nr;
+  m.m_vfs_fs_chown.uid = newuid;
+  m.m_vfs_fs_chown.gid = newgid;
 
   /* Send/rec request */
   r = fs_sendrec(fs_e, &m);
 
   /* Return new mode to caller. */
-  *new_modep = (mode_t) m.RES_MODE;
+  *new_modep = m.m_fs_vfs_chown.mode;
 
   return(r);
 }