diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 20194e0..b48397c 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -60,7 +60,7 @@
 int dm_target_init(void);
 void dm_target_exit(void);
 struct target_type *dm_get_target_type(const char *name);
-void dm_put_target_type(struct target_type *t);
+void dm_put_target_type(struct target_type *tt);
 int dm_target_iterate(void (*iter_func)(struct target_type *tt,
 					void *param), void *param);