diff --git a/manifests/mongos/params.pp b/manifests/mongos/params.pp
index 7be61d997..20dc6cc4e 100644
--- a/manifests/mongos/params.pp
+++ b/manifests/mongos/params.pp
@@ -45,7 +45,7 @@
         $pidfilepath      = '/var/run/mongodb/mongos.pid'
         $unixsocketprefix = '/var/run/mongodb'
         $logpath          = '/var/log/mongodb/mongos.log'
-        $fork             = true
+        $fork             = undef # https://github.com/voxpupuli/puppet-mongodb/issues/667
         $service_template = 'mongodb/mongos/RedHat/mongos.service-dropin.epp'
       }
     }
diff --git a/manifests/params.pp b/manifests/params.pp
index 999752dd3..47841593f 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -51,7 +51,7 @@
       $logpath      = '/var/log/mongodb/mongod.log'
       $pidfilepath  = '/var/run/mongodb/mongod.pid'
       $config       = '/etc/mongod.conf'
-      $fork         = true
+      $fork         = undef   # https://github.com/voxpupuli/puppet-mongodb/issues/667
       $journal      = true
     }
     'Debian': {
diff --git a/spec/classes/mongos_spec.rb b/spec/classes/mongos_spec.rb
index 21c18effb..ce21bcb80 100644
--- a/spec/classes/mongos_spec.rb
+++ b/spec/classes/mongos_spec.rb
@@ -34,7 +34,6 @@
         when 'RedHat', 'Suse'
           expected_content = <<~CONFIG
             configdb = 127.0.0.1:27019
-            fork = true
             pidfilepath = /var/run/mongodb/mongos.pid
             logpath = /var/log/mongodb/mongos.log
             unixSocketPrefix = /var/run/mongodb
diff --git a/spec/classes/server_spec.rb b/spec/classes/server_spec.rb
index 0610f5175..27fd5c2f5 100644
--- a/spec/classes/server_spec.rb
+++ b/spec/classes/server_spec.rb
@@ -79,11 +79,7 @@
             with_content(%r{^systemLog\.path: #{log_path}$})
         end
 
-        if facts[:os]['family'] == 'Debian'
-          it { is_expected.not_to contain_file(config_file).with_content(%r{fork}) }
-        else
-          it { is_expected.to contain_file(config_file).with_content(%r{^  fork: true$}) }
-        end
+        it { is_expected.not_to contain_file(config_file).with_content(%r{fork}) }
 
         it { is_expected.to contain_file('/root/.mongoshrc.js').with_ensure('file').without_content(%r{db\.auth}) }
         it { is_expected.to contain_file('/var/lib/mongo').with(ensure: 'directory', mode: '0750', owner: mongo_user, group: mongo_group) }