diff --git a/block/sheepdog.c b/block/sheepdog.c
index 93c0266..49a9a9e 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -1115,6 +1115,8 @@
                    sd_strerror(rsp->result), filename, snapid, tag);
         if (rsp->result == SD_RES_NO_VDI) {
             ret = -ENOENT;
+        } else if (rsp->result == SD_RES_VDI_LOCKED) {
+            ret = -EBUSY;
         } else {
             ret = -EIO;
         }