diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index 29445938d54a6b77785964d9809fcd064be0878c..407004b2f7d7bb2bc58a0aa4e32f829696c4d795 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -2863,7 +2863,7 @@ static inline uint16_t nvme_check_copy_mcl(NvmeNamespace *ns,
         uint32_t nlb;
         nvme_copy_source_range_parse(iocb->ranges, idx, iocb->format, NULL,
                                      &nlb, NULL, NULL, NULL);
-        copy_len += nlb + 1;
+        copy_len += nlb;
     }
 
     if (copy_len > ns->id_ns.mcl) {