diff --git a/zuul.d/manila-tempest-jobs.yaml b/zuul.d/manila-tempest-jobs.yaml
index f2829bc..6214867 100644
--- a/zuul.d/manila-tempest-jobs.yaml
+++ b/zuul.d/manila-tempest-jobs.yaml
@@ -157,6 +157,7 @@
               backend_names: LONDON,PARIS
               multi_backend: true
               image_password: manila
+              dd_input_file: /dev/urandom
 
 - job:
     name: manila-tempest-plugin-zfsonlinux