diff --git a/manifests/backend.pp b/manifests/backend.pp
index 79ec0587..4225b295 100644
--- a/manifests/backend.pp
+++ b/manifests/backend.pp
@@ -77,7 +77,7 @@
   },
   String                                  $instance                 = 'haproxy',
   String[1]                               $section_name             = $name,
-  Boolean                                 $sort_options_alphabetic  = true,
+  Optional[Boolean]                       $sort_options_alphabetic  = undef,
   Optional[String]                        $description              = undef,
   Optional[String]                        $defaults                 = undef,
   Optional[Stdlib::Absolutepath]          $config_file              = undef,
diff --git a/manifests/defaults.pp b/manifests/defaults.pp
index 636d33fc..a1387b11 100644
--- a/manifests/defaults.pp
+++ b/manifests/defaults.pp
@@ -21,7 +21,7 @@
 #
 define haproxy::defaults (
   Hash    $options                  = {},
-  Boolean $sort_options_alphabetic  = true,
+  Optional[Boolean] $sort_options_alphabetic  = undef,
   String  $instance                 = 'haproxy',
 ) {
   if $instance == 'haproxy' {
diff --git a/manifests/frontend.pp b/manifests/frontend.pp
index 1f3fcc69..574f1e97 100644
--- a/manifests/frontend.pp
+++ b/manifests/frontend.pp
@@ -103,7 +103,7 @@
   },
   String                                  $instance                 = 'haproxy',
   String[1]                               $section_name             = $name,
-  Boolean                                 $sort_options_alphabetic  = true,
+  Optional[Boolean]                       $sort_options_alphabetic  = undef,
   Optional[String]                        $description              = undef,
   Optional[String]                        $defaults                 = undef,
   Boolean                                 $defaults_use_backend     = true,
diff --git a/manifests/listen.pp b/manifests/listen.pp
index 0b73609c..e72dc72c 100644
--- a/manifests/listen.pp
+++ b/manifests/listen.pp
@@ -107,7 +107,7 @@
   },
   String                                  $instance                 = 'haproxy',
   String[1]                               $section_name             = $name,
-  Boolean                                 $sort_options_alphabetic  = true,
+  Optional[Boolean]                        $sort_options_alphabetic  = undef,
   Optional[String]                        $description              = undef,
   Optional[String]                        $defaults                 = undef,
   Optional[Stdlib::Absolutepath]          $config_file              = undef,
diff --git a/manifests/resolver.pp b/manifests/resolver.pp
index 330005b9..f193c803 100644
--- a/manifests/resolver.pp
+++ b/manifests/resolver.pp
@@ -105,7 +105,7 @@
   Optional[Integer[512, 8192]]    $accepted_payload_size    = undef,
   String                          $instance                 = 'haproxy',
   String[1]                       $section_name             = $name,
-  Boolean                         $sort_options_alphabetic  = true,
+  Optional[Boolean]               $sort_options_alphabetic  = undef,
   Boolean                         $collect_exported         = true,
   Optional[Stdlib::Absolutepath]  $config_file              = undef,
   Optional[String]                $defaults                 = undef,