diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index a677ba9f5c..550850b264 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -980,7 +980,7 @@ int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m)
 
     assert(l2_index + m->nb_clusters <= s->l2_slice_size);
     for (i = 0; i < m->nb_clusters; i++) {
-        uint64_t offset = cluster_offset + (i << s->cluster_bits);
+        uint64_t offset = cluster_offset + ((uint64_t)i << s->cluster_bits);
         /* if two concurrent writes happen to the same unallocated cluster
          * each write allocates separate cluster and writes data concurrently.
          * The first one to complete updates l2 table with pointer to its