diff --git a/src/com/mirantis/mk/Debian.groovy b/src/com/mirantis/mk/Debian.groovy
index 47cd772..1b39d14 100644
--- a/src/com/mirantis/mk/Debian.groovy
+++ b/src/com/mirantis/mk/Debian.groovy
@@ -268,7 +268,7 @@
     salt.runSaltProcessStep(env, target, 'system.reboot', [], null, true, 5)
 
     common.retry(timeout, attempts) {
-        if (salt.runSaltProcessStep(env, target, 'file.file_exists', ['/tmp/rebooting'], null, true, 5)['return'][0].values()[0].toBoolean()) {
+        if (salt.runSaltProcessStep(env, target, 'cmd.run', ['test -e /tmp/rebooting || echo NOFILE'], null, true, 5)['return'][0].values()[0] != "NOFILE") {
             error("The system is still rebooting...")
         }
     }
@@ -354,4 +354,4 @@
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/com/mirantis/mk/Openstack.groovy b/src/com/mirantis/mk/Openstack.groovy
index 98df398..0a55867 100644
--- a/src/com/mirantis/mk/Openstack.groovy
+++ b/src/com/mirantis/mk/Openstack.groovy
@@ -58,7 +58,8 @@
         // downloading packages which are not support Python 2.7
         'python-openstackclient==4.0.0',
         'python-heatclient==1.18.0',
-        'docutils==0.16'
+        'docutils==0.16',
+        'pyrsistent<0.17.1',
     ]
 
     if (version == 'kilo') {