diff --git a/block/block-copy.c b/block/block-copy.c
index 4713c8f2a3..7c7f7acbae 100644
--- a/block/block-copy.c
+++ b/block/block-copy.c
@@ -418,7 +418,7 @@ out:
 static coroutine_fn int block_copy_task_entry(AioTask *task)
 {
     BlockCopyTask *t = container_of(task, BlockCopyTask, task);
-    bool error_is_read;
+    bool error_is_read = false;
     int ret;
 
     ret = block_copy_do_copy(t->s, t->offset, t->bytes, t->zeroes,