diff --git a/manifests/config.pp b/manifests/config.pp
index 9010973..7ec3583 100644
--- a/manifests/config.pp
+++ b/manifests/config.pp
@@ -26,7 +26,7 @@ class tacker::config (
 
   include ::tacker::deps
 
-  validate_hash($tacker_config)
+  validate_legacy(Hash, 'validate_hash', $tacker_config)
 
   create_resources('tacker_config', $tacker_config)
 }
diff --git a/manifests/db.pp b/manifests/db.pp
index 5ad79d2..3a79247 100644
--- a/manifests/db.pp
+++ b/manifests/db.pp
@@ -56,8 +56,8 @@ class tacker::db (
 
   include ::tacker::deps
 
-  validate_re($database_connection,
-    '^(sqlite|mysql(\+pymysql)?|postgresql):\/\/(\S+:\S+@\S+\/\S+)?')
+  validate_legacy(Oslo::Dbconn, 'validate_re', $database_connection,
+    ['^(sqlite|mysql(\+pymysql)?|postgresql):\/\/(\S+:\S+@\S+\/\S+)?'])
 
   oslo::db { 'tacker_config':
     db_max_retries => $database_db_max_retries,
diff --git a/manifests/db/mysql.pp b/manifests/db/mysql.pp
index 65d0603..c47d9b4 100644
--- a/manifests/db/mysql.pp
+++ b/manifests/db/mysql.pp
@@ -45,7 +45,7 @@ class tacker::db::mysql(
 
   include ::tacker::deps
 
-  validate_string($password)
+  validate_legacy(String, 'validate_string', $password)
 
   ::openstacklib::db::mysql { 'tacker':
     user          => $user,
diff --git a/manifests/policy.pp b/manifests/policy.pp
index f54d7a7..893d88c 100644
--- a/manifests/policy.pp
+++ b/manifests/policy.pp
@@ -31,7 +31,7 @@ class tacker::policy (
   include ::tacker::deps
   include ::tacker::params
 
-  validate_hash($policies)
+  validate_legacy(Hash, 'validate_hash', $policies)
 
   Openstacklib::Policy::Base {
     file_path  => $policy_path,