diff --git a/include/minix/ipc.h b/include/minix/ipc.h
index 0c64dcad5..f1bf5ac31 100644
--- a/include/minix/ipc.h
+++ b/include/minix/ipc.h
@@ -227,6 +227,16 @@ typedef struct {
 } mess_vfs_fs_mountpoint;
 _ASSERT_MSG_SIZE(mess_vfs_fs_mountpoint);
 
+typedef struct {
+	dev_t device;
+
+	cp_grant_id_t grant;
+	size_t path_len;
+
+	uint8_t data[40];
+} mess_vfs_fs_new_driver;
+_ASSERT_MSG_SIZE(mess_vfs_fs_new_driver);
+
 typedef struct {
 	dev_t device;
 
@@ -395,6 +405,7 @@ typedef struct {
 	mess_vfs_fs_lookup m_vfs_fs_lookup;
 	mess_fs_vfs_lookup m_fs_vfs_lookup;
 	mess_vfs_fs_mountpoint m_vfs_fs_mountpoint;
+	mess_vfs_fs_new_driver m_vfs_fs_new_driver;
 	mess_vfs_fs_readsuper m_vfs_fs_readsuper;
 	mess_fs_vfs_readsuper m_fs_vfs_readsuper;
 	mess_vfs_fs_rename m_vfs_fs_rename;
diff --git a/servers/ext2/misc.c b/servers/ext2/misc.c
index 03191a9a8..2405ad338 100644
--- a/servers/ext2/misc.c
+++ b/servers/ext2/misc.c
@@ -71,9 +71,9 @@ int fs_new_driver(void)
   char label[sizeof(fs_dev_label)];
   int r;
 
-  dev = fs_m_in.REQ_DEV;
-  label_gid = (cp_grant_id_t) fs_m_in.REQ_GRANT;
-  label_len = (size_t) fs_m_in.REQ_PATH_LEN;
+  dev = fs_m_in.m_vfs_fs_new_driver.device;
+  label_gid = fs_m_in.m_vfs_fs_new_driver.grant;
+  label_len = fs_m_in.m_vfs_fs_new_driver.path_len;
 
   if (label_len > sizeof(label))
 	return(EINVAL);
diff --git a/servers/iso9660fs/misc.c b/servers/iso9660fs/misc.c
index 456f20157..6749affe5 100644
--- a/servers/iso9660fs/misc.c
+++ b/servers/iso9660fs/misc.c
@@ -26,9 +26,9 @@ int fs_new_driver(void)
   char label[sizeof(fs_dev_label)];
   int r;
 
-  dev = fs_m_in.REQ_DEV;
-  label_gid = (cp_grant_id_t) fs_m_in.REQ_GRANT;
-  label_len = (size_t) fs_m_in.REQ_PATH_LEN;
+  dev = fs_m_in.m_vfs_fs_new_driver.device;
+  label_gid = fs_m_in.m_vfs_fs_new_driver.grant;
+  label_len = fs_m_in.m_vfs_fs_new_driver.path_len;
 
   if (label_len > sizeof(label))
 	return(EINVAL);
diff --git a/servers/mfs/misc.c b/servers/mfs/misc.c
index d633595b6..e4bcbc31b 100644
--- a/servers/mfs/misc.c
+++ b/servers/mfs/misc.c
@@ -60,9 +60,9 @@ int fs_new_driver(void)
   char label[sizeof(fs_dev_label)];
   int r;
 
-  dev = fs_m_in.REQ_DEV;
-  label_gid = (cp_grant_id_t) fs_m_in.REQ_GRANT;
-  label_len = (size_t) fs_m_in.REQ_PATH_LEN;
+  dev = fs_m_in.m_vfs_fs_new_driver.device;
+  label_gid = fs_m_in.m_vfs_fs_new_driver.grant;
+  label_len = fs_m_in.m_vfs_fs_new_driver.path_len;
 
   if (label_len > sizeof(label))
 	return(EINVAL);
diff --git a/servers/vfs/request.c b/servers/vfs/request.c
index b31f5f085..17df01af2 100644
--- a/servers/vfs/request.c
+++ b/servers/vfs/request.c
@@ -676,9 +676,9 @@ int req_newdriver(
 
   /* Fill in request message */
   m.m_type = REQ_NEW_DRIVER;
-  m.REQ_DEV = dev;
-  m.REQ_GRANT = grant_id;
-  m.REQ_PATH_LEN = len;
+  m.m_vfs_fs_new_driver.device = dev;
+  m.m_vfs_fs_new_driver.grant = grant_id;
+  m.m_vfs_fs_new_driver.path_len = len;
 
   /* Issue request */
   r = fs_sendrec(fs_e, &m);