diff --git a/manifests/config.pp b/manifests/config.pp
index 3c459ff..25f6623 100644
--- a/manifests/config.pp
+++ b/manifests/config.pp
@@ -30,8 +30,8 @@ class congress::config (
 
   include ::congress::deps
 
-  validate_hash($congress_config)
-  validate_hash($congress_api_paste_ini)
+  validate_legacy(Hash, 'validate_hash', $congress_config)
+  validate_legacy(Hash, 'validate_hash', $congress_api_paste_ini)
 
   create_resources('congress_config', $congress_config)
   create_resources('congress_api_paste_ini', $congress_api_paste_ini)
diff --git a/manifests/db.pp b/manifests/db.pp
index e364505..26de847 100644
--- a/manifests/db.pp
+++ b/manifests/db.pp
@@ -56,8 +56,8 @@ class congress::db (
 
   include ::congress::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 { 'congress_config':
     connection     => $database_connection,
diff --git a/manifests/db/mysql.pp b/manifests/db/mysql.pp
index 4202333..1041a81 100644
--- a/manifests/db/mysql.pp
+++ b/manifests/db/mysql.pp
@@ -45,7 +45,7 @@ class congress::db::mysql(
 
   include ::congress::deps
 
-  validate_string($password)
+  validate_legacy(String, 'validate_string', $password)
 
   ::openstacklib::db::mysql { 'congress':
     user          => $user,
diff --git a/manifests/policy.pp b/manifests/policy.pp
index 3ebb4ac..d429a9f 100644
--- a/manifests/policy.pp
+++ b/manifests/policy.pp
@@ -31,7 +31,7 @@ class congress::policy (
   include ::congress::deps
   include ::congress::params
 
-  validate_hash($policies)
+  validate_legacy(Hash, 'validate_hash', $policies)
 
   Openstacklib::Policy::Base {
     file_path  => $policy_path,