diff --git a/installers/charm/keystone/src/charm.py b/installers/charm/keystone/src/charm.py
index 6693080..8300b88 100755
--- a/installers/charm/keystone/src/charm.py
+++ b/installers/charm/keystone/src/charm.py
@@ -343,6 +343,11 @@
                     {"LDAP_GROUP_TREE_DN": config_ldap.ldap_group_tree_dn}
                 )
 
+            if config_ldap.ldap_tls_cacert_base64:
+                container_builder.add_envs(
+                    {"LDAP_TLS_CACERT_BASE64": config_ldap.ldap_tls_cacert_base64}
+                )
+
             if config_ldap.ldap_use_starttls:
                 container_builder.add_envs(
                     {