diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 52f9420..6ec9d53 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -554,7 +554,7 @@
 				buf = bvec_kmap_irq(bv, &flags);
 				memset(buf + remainder, 0,
 				       bv->bv_len - remainder);
-				bvec_kunmap_irq(bv, &flags);
+				bvec_kunmap_irq(buf, &flags);
 			}
 			pos += bv->bv_len;
 		}