diff --git a/deployment/horizon/horizon-container-puppet.yaml b/deployment/horizon/horizon-container-puppet.yaml
index ebccca9fd6..f028bc84bb 100644
--- a/deployment/horizon/horizon-container-puppet.yaml
+++ b/deployment/horizon/horizon-container-puppet.yaml
@@ -289,30 +289,30 @@ outputs:
             environment:
               KOLLA_CONFIG_STRATEGY: COPY_ALWAYS
               # Installed plugins:
-              ENABLE_CLOUDKITTY: no
-              ENABLE_IRONIC: yes
-              ENABLE_MAGNUM: no
-              ENABLE_MANILA: yes
-              ENABLE_HEAT: yes
+              ENABLE_CLOUDKITTY: 'no'
+              ENABLE_IRONIC: 'yes'
+              ENABLE_MAGNUM: 'no'
+              ENABLE_MANILA: 'yes'
+              ENABLE_HEAT: 'yes'
               # murano depends on heat-dashboard that is not yet installed
               # https://bugs.launchpad.net/tripleo/+bug/1752132
-              ENABLE_MURANO: no
-              ENABLE_MISTRAL: yes
-              ENABLE_OCTAVIA: yes
-              ENABLE_SAHARA: yes
-              ENABLE_TROVE: no
+              ENABLE_MURANO: 'no'
+              ENABLE_MISTRAL: 'yes'
+              ENABLE_OCTAVIA: 'yes'
+              ENABLE_SAHARA: 'yes'
+              ENABLE_TROVE: 'no'
               # Not installed:
-              ENABLE_FREEZER: no
-              ENABLE_FWAAS: no
-              ENABLE_KARBOR: no
-              ENABLE_DESIGNATE: no
-              ENABLE_SEARCHLIGHT: no
-              ENABLE_SENLIN: no
-              ENABLE_SOLUM: no
-              ENABLE_TACKER: no
-              ENABLE_WATCHER: no
-              ENABLE_ZAQAR: no
-              ENABLE_ZUN: no
+              ENABLE_FREEZER: 'no'
+              ENABLE_FWAAS: 'no'
+              ENABLE_KARBOR: 'no'
+              ENABLE_DESIGNATE: 'no'
+              ENABLE_SEARCHLIGHT: 'no'
+              ENABLE_SENLIN: 'no'
+              ENABLE_SOLUM: 'no'
+              ENABLE_TACKER: 'no'
+              ENABLE_WATCHER: 'no'
+              ENABLE_ZAQAR: 'no'
+              ENABLE_ZUN: 'no'
       host_prep_tasks:
         - name: create persistent directories
           file: