diff --git a/block-qcow2.c b/block-qcow2.c
index c4cd38d..151e688 100644
--- a/block-qcow2.c
+++ b/block-qcow2.c
@@ -1443,6 +1443,9 @@ static BlockDriverAIOCB *qcow_aio_readv(BlockDriverState *bs,
     return &acb->common;
 }
 
+static int nb_writes;
+static BlockDriverAIOCB *pending_writes[300];
+
 static void qcow_aio_write_cb(void *opaque, int ret)
 {
     QCowAIOCB *acb = opaque;
@@ -1518,6 +1521,18 @@ done:
         qemu_vfree(acb->orig_buf);
     acb->common.cb(acb->common.opaque, ret);
     qemu_aio_release(acb);
+
+    {
+        int i;
+
+        for (i = 1; i < nb_writes; ++i) {
+            pending_writes[i - 1] = pending_writes[i];
+        }
+        --nb_writes;
+        if (nb_writes) {
+            qcow_aio_write_cb(pending_writes[0], 0);
+        }
+    }
 }
 
 static BlockDriverAIOCB *qcow_aio_writev(BlockDriverState *bs,
@@ -1535,7 +1550,12 @@ static BlockDriverAIOCB *qcow_aio_writev(BlockDriverState *bs,
     if (!acb)
         return NULL;
 
-    qcow_aio_write_cb(acb, 0);
+    pending_writes[nb_writes++] = acb;
+
+    if (nb_writes == 1) {
+        qcow_aio_write_cb(acb, 0);
+    }
+
     return &acb->common;
 }