update preffix, in order to avoid pkg conflicts on pool
diff --git a/aptly/server/mirror/debian/jenkins.yml b/aptly/server/mirror/debian/jenkins.yml
index 1c6ee8c..f04f4d9 100644
--- a/aptly/server/mirror/debian/jenkins.yml
+++ b/aptly/server/mirror/debian/jenkins.yml
@@ -12,8 +12,8 @@
           publisher:
             component: extra
             distributions:
-              - nightly/trusty
-              - nightly/xenial
+              - trusty/nightly
+              - xenial/nightly
         jenkins-debian-glue:
           source: http://jenkins.grml.org/debian/
           distribution: jenkins-debian-glue
@@ -26,5 +26,5 @@
           publisher:
             component: extra
             distributions:
-              - nightly/trusty
-              - nightly/xenial
+              - trusty/nightly
+              - xenial/nightly