diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 69de8b4..890e2ff 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -436,7 +436,8 @@
 {
 	key->virtual = 0;
 	key->dev = 0;
-	key->block = from_oblock(oblock);
+	key->block_begin = from_oblock(oblock);
+	key->block_end = key->block_begin + 1ULL;
 }
 
 /*