diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 516a851d3d..f45972e3c8 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -17506,7 +17506,7 @@ qemuDomainSetBlockIoTune(virDomainPtr dom,
         qemuDomainObjEnterMonitor(driver, vm);
         ret = qemuMonitorSetBlockIoThrottle(priv->mon, device,
                                             &info, supportMaxOptions,
-                                            supportGroupNameOption,
+                                            set_fields & QEMU_BLOCK_IOTUNE_SET_GROUP_NAME,
                                             supportMaxLengthOptions);
         if (qemuDomainObjExitMonitor(driver, vm) < 0)
             ret = -1;
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 6c38ad7e38..e30b72cd40 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -4607,7 +4607,7 @@ int qemuMonitorJSONSetBlockIoThrottle(qemuMonitorPtr mon,
 
     if (supportGroupNameOption &&
         virJSONValueObjectAdd(args,
-                              "s:group", info->group_name,
+                              "S:group", info->group_name,
                               NULL) < 0)
         goto cleanup;