diff --git a/devstack-vm-update-image.py b/devstack-vm-update-image.py
index 3d1f24c3..6d7e900a 100755
--- a/devstack-vm-update-image.py
+++ b/devstack-vm-update-image.py
@@ -333,7 +333,7 @@ def main():
     client = utils.get_client(provider)
 
     for base_image in provider.base_images:
-        if base_image.min_ready <= 0:
+        if base_image.min_ready < 0:
             continue
         print "Working on base image %s" % base_image.name