Index: uspace/srv/fs/fat/fat_ops.c
===================================================================
--- uspace/srv/fs/fat/fat_ops.c	(revision 3ecc02eac7d067436e7876f91133503ea5412e5e)
+++ uspace/srv/fs/fat/fat_ops.c	(revision 4ef6645dd99822554c46ff276f9076d4bed7c09d)
@@ -889,5 +889,5 @@
 void fat_mount(ipc_callid_t rid, ipc_call_t *request)
 {
-	libfs_mount(&fat_libfs_ops, rid, request);
+	libfs_mount(&fat_libfs_ops, fat_reg.fs_handle, rid, request);
 }
 
Index: uspace/srv/fs/tmpfs/tmpfs_ops.c
===================================================================
--- uspace/srv/fs/tmpfs/tmpfs_ops.c	(revision 3ecc02eac7d067436e7876f91133503ea5412e5e)
+++ uspace/srv/fs/tmpfs/tmpfs_ops.c	(revision 4ef6645dd99822554c46ff276f9076d4bed7c09d)
@@ -410,5 +410,5 @@
 void tmpfs_mount(ipc_callid_t rid, ipc_call_t *request)
 {
-	libfs_mount(&tmpfs_libfs_ops, rid, request);
+	libfs_mount(&tmpfs_libfs_ops, tmpfs_reg.fs_handle, rid, request);
 }