diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index fc4f743..7ec1b11 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -121,8 +121,8 @@
 };
 
 #define MIN_IOS 256
-static kmem_cache_t *_io_cache;
-static kmem_cache_t *_tio_cache;
+static struct kmem_cache *_io_cache;
+static struct kmem_cache *_tio_cache;
 
 static int __init local_init(void)
 {