diff --git a/migration/rdma.c b/migration/rdma.c
index 9fa3b176eb6a..d5251cd820cd 100644
--- a/migration/rdma.c
+++ b/migration/rdma.c
@@ -3613,13 +3613,16 @@ static int qemu_rdma_registration_handle(QEMUFile *f, void *opaque)
                 }
                 chunk_start = ram_chunk_start(block, chunk);
                 chunk_end = ram_chunk_end(block, chunk + reg->chunks);
+                /* avoid "-Waddress-of-packed-member" warning */
+                uint32_t tmp_rkey = 0;
                 if (qemu_rdma_register_and_get_keys(rdma, block,
-                            (uintptr_t)host_addr, NULL, &reg_result->rkey,
+                            (uintptr_t)host_addr, NULL, &tmp_rkey,
                             chunk, chunk_start, chunk_end)) {
                     error_report("cannot get rkey");
                     ret = -EINVAL;
                     goto out;
                 }
+                reg_result->rkey = tmp_rkey;
 
                 reg_result->host_addr = (uintptr_t)block->local_host_addr;