diff --git a/migration/ram.c b/migration/ram.c
index 49068e86d3..52dd678092 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -235,7 +235,7 @@ int64_t ramblock_recv_bitmap_send(QEMUFile *file,
     bitmap_to_le(le_bitmap, block->receivedmap, nbits);
 
     /* Size of the bitmap, in bytes */
-    size = nbits / 8;
+    size = DIV_ROUND_UP(nbits, 8);
 
     /*
      * size is always aligned to 8 bytes for 64bit machines, but it
@@ -3944,7 +3944,7 @@ int ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *block)
     int ret = -EINVAL;
     QEMUFile *file = s->rp_state.from_dst_file;
     unsigned long *le_bitmap, nbits = block->used_length >> TARGET_PAGE_BITS;
-    uint64_t local_size = nbits / 8;
+    uint64_t local_size = DIV_ROUND_UP(nbits, 8);
     uint64_t size, end_mark;
 
     trace_ram_dirty_bitmap_reload_begin(block->idstr);