diff --git a/manifests/params.pp b/manifests/params.pp
index aff38d7..7532f3f 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -5,7 +5,7 @@
 # @param [String] pl_server_fqdn the fqdn of the postgresql server. Any other
 #   system will be configured as client
 # @param [Array] reqpackages_server the packages for the server
-# @param [Array] reqpackages_extensions the packages for extensions
+# @param [String] reqpackages_extensions the packages for extensions
 # @param [String] reqpackages_client the packages for the client
 # @param [String] pkg_ensure which version of the packages to install, i.e.
 #   'latest', 'present' '13.20',
@@ -31,7 +31,7 @@ class postgresql_cd::params (
 
   # installation
   Array $reqpackages_server       = ['postgresql-server','postgresql-contrib'],
-  Array $reqpackages_extensions   = ['pg_stat_statements','timescaledb'],
+  String $reqpackages_extensions  = 'timescaledb',
   String $reqpackages_client      = 'postgresql',
   String $pkg_ensure              = 'latest',