diff --git a/tests/test_glance.py b/tests/test_glance.py
index 99db954..7313fdd 100644
--- a/tests/test_glance.py
+++ b/tests/test_glance.py
@@ -61,7 +61,7 @@
     try:
         image = openstack_clients.image.images.create(
             name=image_name,
-            disk_format='iso',
+            disk_format='raw',
             container_format='bare')
         logger.info("Created an image {} in Glance.".format(image_name))
     except BaseException as e: