diff --git a/ironic_lib/disk_utils.py b/ironic_lib/disk_utils.py
index 4f6e4aa0..322d4b91 100644
--- a/ironic_lib/disk_utils.py
+++ b/ironic_lib/disk_utils.py
@@ -456,8 +456,9 @@ def qemu_img_info(path):
 
     out, err = utils.execute('env', 'LC_ALL=C', 'LANG=C',
                              'qemu-img', 'info', path,
+                             '--output=json',
                              prlimit=_qemu_img_limits())
-    return imageutils.QemuImgInfo(out)
+    return imageutils.QemuImgInfo(out, format='json')
 
 
 def _retry_on_res_temp_unavailable(exc):
diff --git a/ironic_lib/tests/test_disk_utils.py b/ironic_lib/tests/test_disk_utils.py
index 433a058a..eb56ec8a 100644
--- a/ironic_lib/tests/test_disk_utils.py
+++ b/ironic_lib/tests/test_disk_utils.py
@@ -617,8 +617,9 @@ class OtherFunctionTestCase(base.IronicLibTestCase):
         path_exists_mock.assert_called_once_with('img')
         execute_mock.assert_called_once_with('env', 'LC_ALL=C', 'LANG=C',
                                              'qemu-img', 'info', 'img',
+                                             '--output=json',
                                              prlimit=mock.ANY)
-        qemu_img_info_mock.assert_called_once_with('out')
+        qemu_img_info_mock.assert_called_once_with('out', format='json')
 
     @mock.patch.object(utils, 'execute', autospec=True)
     def test_convert_image(self, execute_mock):