diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 2582dadf2e..4b23ee061b 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -11923,9 +11923,9 @@ qemuDomainSetBlockIoTune(virDomainPtr dom,
         qemuDomainObjEnterMonitorWithDriver(driver, vm);
         ret = qemuMonitorSetBlockIoThrottle(priv->mon, device, &info);
         qemuDomainObjExitMonitorWithDriver(driver, vm);
-        vm->def->disks[idx]->blkdeviotune = info;
         if (ret < 0)
             goto endjob;
+        vm->def->disks[idx]->blkdeviotune = info;
     }
 
     if (flags & VIR_DOMAIN_AFFECT_CONFIG) {