diff --git a/tests/qemu-iotests/093 b/tests/qemu-iotests/093
index 3c4f5173ce..50c1e7f2ec 100755
--- a/tests/qemu-iotests/093
+++ b/tests/qemu-iotests/093
@@ -267,13 +267,12 @@ class ThrottleTestCoroutine(ThrottleTestCase):
     test_img = "null-co://"
 
 class ThrottleTestGroupNames(iotests.QMPTestCase):
-    test_img = "null-aio://"
     max_drives = 3
 
     def setUp(self):
         self.vm = iotests.VM()
         for i in range(0, self.max_drives):
-            self.vm.add_drive(self.test_img,
+            self.vm.add_drive("null-co://",
                               "throttling.iops-total=100,file.read-zeroes=on")
         self.vm.launch()
 
@@ -376,10 +375,10 @@ class ThrottleTestRemovableMedia(iotests.QMPTestCase):
 
     def test_removable_media(self):
         # Add a couple of dummy nodes named cd0 and cd1
-        result = self.vm.qmp("blockdev-add", driver="null-aio",
+        result = self.vm.qmp("blockdev-add", driver="null-co",
                              read_zeroes=True, node_name="cd0")
         self.assert_qmp(result, 'return', {})
-        result = self.vm.qmp("blockdev-add", driver="null-aio",
+        result = self.vm.qmp("blockdev-add", driver="null-co",
                              read_zeroes=True, node_name="cd1")
         self.assert_qmp(result, 'return', {})
 
diff --git a/tests/qemu-iotests/245 b/tests/qemu-iotests/245
index 41218d5f1d..e66a23c5f0 100644
--- a/tests/qemu-iotests/245
+++ b/tests/qemu-iotests/245
@@ -598,7 +598,7 @@ class TestBlockdevReopen(iotests.QMPTestCase):
         ##################
         ###### null ######
         ##################
-        opts = {'driver': 'null-aio', 'node-name': 'root', 'size': 1024}
+        opts = {'driver': 'null-co', 'node-name': 'root', 'size': 1024}
 
         result = self.vm.qmp('blockdev-add', conv_keys = False, **opts)
         self.assert_qmp(result, 'return', {})