diff --git a/manifests/module/incubator.pp b/manifests/module/incubator.pp
index 2ecab28..130afe6 100644
--- a/manifests/module/incubator.pp
+++ b/manifests/module/incubator.pp
@@ -1,28 +1,28 @@
 # == Class: icingaweb2::module::incubator
 #
 # Install and enable the incubator module.
 #
 # === Parameters
 #
 # [*ensure*]
 #   Enable or disable module. Defaults to `present`
 #
 # [*git_repository*]
 #   Set a git repository URL. Defaults to github.
 #
 # [*git_revision*]
 #   Set either a branch or a tag name, eg. `stable/0.7.0` or `v0.7.0`.
 #
 class icingaweb2::module::incubator(
+  String                    $git_revision,
   Enum['absent', 'present'] $ensure         = 'present',
   String                    $git_repository = 'https://github.com/Icinga/icingaweb2-module-incubator.git',
-  String                    $git_revision   = undef,
 ){
 
   icingaweb2::module { 'incubator':
     ensure         => $ensure,
     git_repository => $git_repository,
     git_revision   => $git_revision,
   }
 
 }
diff --git a/manifests/module/ipl.pp b/manifests/module/ipl.pp
index eeb6b76..2b91321 100644
--- a/manifests/module/ipl.pp
+++ b/manifests/module/ipl.pp
@@ -1,28 +1,28 @@
 # == Class: icingaweb2::module::ipl
 #
 # Install and enable the ipl module.
 #
 # === Parameters
 #
 # [*ensure*]
 #   Enable or disable module. Defaults to `present`
 #
 # [*git_repository*]
 #   Set a git repository URL. Defaults to github.
 #
 # [*git_revision*]
 #   Set either a branch or a tag name, eg. `stable/0.7.0` or `v0.7.0`.
 #
 class icingaweb2::module::ipl(
+  String                    $git_revision,
   Enum['absent', 'present'] $ensure         = 'present',
   String                    $git_repository = 'https://github.com/Icinga/icingaweb2-module-ipl.git',
-  String                    $git_revision   = undef,
 ){
 
   icingaweb2::module { 'ipl':
     ensure         => $ensure,
     git_repository => $git_repository,
     git_revision   => $git_revision,
   }
 
 }
diff --git a/manifests/module/reactbundle.pp b/manifests/module/reactbundle.pp
index f446330..cd050c9 100644
--- a/manifests/module/reactbundle.pp
+++ b/manifests/module/reactbundle.pp
@@ -1,29 +1,29 @@
 # == Class: icingaweb2::module::reactbundle
 #
 # Install and enable the reactbundle module.
 #
 # === Parameters
 #
 # [*ensure*]
 #   Enable or disable module. Defaults to `present`
 #
 # [*git_repository*]
 #   Set a git repository URL. Defaults to github.
 #
 # [*git_revision*]
 #   Set either a branch or a tag name, eg. `stable/0.7.0` or `v0.7.0`.
 #
 class icingaweb2::module::reactbundle(
+  String                    $git_revision,
   Enum['absent', 'present'] $ensure         = 'present',
   String                    $git_repository = 'https://github.com/Icinga/icingaweb2-module-reactbundle.git',
-  String                    $git_revision   = undef,
 ){
 
   icingaweb2::module { 'reactbundle':
     ensure         => $ensure,
     git_repository => $git_repository,
     git_revision   => $git_revision,
   }
 
 }