diff --git a/manifests/config.pp b/manifests/config.pp
index 09ce564b..fc596e21 100644
--- a/manifests/config.pp
+++ b/manifests/config.pp
@@ -26,7 +26,7 @@ class gnocchi::config (
 
   include ::gnocchi::deps
 
-  validate_hash($gnocchi_config)
+  validate_legacy(Hash, 'validate_hash', $gnocchi_config)
 
   create_resources('gnocchi_config', $gnocchi_config)
 }
diff --git a/manifests/db.pp b/manifests/db.pp
index db332b02..e735e30f 100644
--- a/manifests/db.pp
+++ b/manifests/db.pp
@@ -23,8 +23,8 @@ class gnocchi::db (
   # to use gnocchi::<myparam> if gnocchi::db::<myparam> isn't specified.
   $database_connection_real = pick($::gnocchi::database_connection, $database_connection)
 
-  validate_re($database_connection_real,
-    '^(sqlite|mysql(\+pymysql)?|postgresql):\/\/(\S+:\S+@\S+\/\S+)?')
+  validate_legacy(Oslo::Dbconn, 'validate_re', $database_connection_real,
+    ['^(sqlite|mysql(\+pymysql)?|postgresql):\/\/(\S+:\S+@\S+\/\S+)?'])
 
   if $database_connection_real {
     case $database_connection_real {
diff --git a/manifests/db/mysql.pp b/manifests/db/mysql.pp
index 35ff364f..8a4c7258 100644
--- a/manifests/db/mysql.pp
+++ b/manifests/db/mysql.pp
@@ -45,7 +45,7 @@ class gnocchi::db::mysql(
 
   include ::gnocchi::deps
 
-  validate_string($password)
+  validate_legacy(String, 'validate_string', $password)
 
   ::openstacklib::db::mysql { 'gnocchi':
     user          => $user,
diff --git a/manifests/policy.pp b/manifests/policy.pp
index ebc2f87c..d79204aa 100644
--- a/manifests/policy.pp
+++ b/manifests/policy.pp
@@ -31,7 +31,7 @@ class gnocchi::policy (
   include ::gnocchi::deps
   include ::gnocchi::params
 
-  validate_hash($policies)
+  validate_legacy(Hash, 'validate_hash', $policies)
 
   Openstacklib::Policy::Base {
     file_path  => $policy_path,