diff --git a/rebuild b/rebuild
index d907486..08ac52e 100644
--- a/rebuild
+++ b/rebuild
@@ -2,4 +2,4 @@
 # when dependencies of the charm change,
 # but nothing in the charm needs to.
 # simply change the uuid to something new
-1b817f14-1742-11e8-bf02-13a179b934e9
+93e11b9e-86a6-11e8-b3ac-9f8b2e5df0b9
diff --git a/src/tests/basic_deployment.py b/src/tests/basic_deployment.py
index 4801bb5..128e230 100644
--- a/src/tests/basic_deployment.py
+++ b/src/tests/basic_deployment.py
@@ -87,9 +87,7 @@ class CephFsBasicDeployment(OpenStackAmuletDeployment):
         ceph_fs_config = {
             'source': self.source,
         }
-        # NOTE(jamespage): fix fsid to allow later validation
         ceph_mon_config = {
-            'fsid': '6547bd3e-1397-11e2-82e5-53567c8d32dc',
             'source': self.source,
         }
         # Include a non-existent device as osd-devices is a whitelist,
@@ -180,9 +178,10 @@ class CephFsBasicDeployment(OpenStackAmuletDeployment):
         u.log.debug('Checking ceph config file data...')
         unit = self.ceph_mon0_sentry
         conf = '/etc/ceph/ceph.conf'
+        (fsid, _) = unit.run('leader-get fsid')
         expected = {
             'global': {
-                'fsid': '6547bd3e-1397-11e2-82e5-53567c8d32dc',
+                'fsid': fsid,
                 'log to syslog': 'false',
                 'err to syslog': 'false',
                 'clog to syslog': 'false',