diff --git a/REFERENCE.md b/REFERENCE.md
index 5707b02e..9e07a9d2 100644
--- a/REFERENCE.md
+++ b/REFERENCE.md
@@ -2316,6 +2316,7 @@ Struct[{
     Optional['AmbientCapabilities']       => Variant[Pattern[/^CAP_[A-Z_]+$/],Array[Pattern[/^CAP_[A-Z_]+$/],1]],
     Optional['User']                      => String[1],
     Optional['Group']                     => String[1],
+    Optional['WorkingDirectory']          => String[0],
     Optional['Type']                      => Enum['simple', 'exec', 'forking', 'oneshot', 'dbus', 'notify', 'idle'],
     Optional['ExitType']                  => Enum['main', 'cgroup'],
     Optional['RemainAfterExit']           => Boolean,
diff --git a/spec/type_aliases/systemd_unit_service_spec.rb b/spec/type_aliases/systemd_unit_service_spec.rb
index 505a185a..d4f1eecd 100644
--- a/spec/type_aliases/systemd_unit_service_spec.rb
+++ b/spec/type_aliases/systemd_unit_service_spec.rb
@@ -44,4 +44,9 @@
   it { is_expected.to allow_value({ 'Group' => 'root' }) }
   it { is_expected.to allow_value({ 'StandardOutput' => 'null' }) }
   it { is_expected.to allow_value({ 'StandardError' => 'null' }) }
+
+  it { is_expected.to allow_value({ 'WorkingDirectory' => '/var/lib/here' }) }
+  it { is_expected.to allow_value({ 'WorkingDirectory' => '-/var/lib/here' }) }
+  it { is_expected.to allow_value({ 'WorkingDirectory' => '~' }) }
+  it { is_expected.to allow_value({ 'WorkingDirectory' => '' }) }
 end
diff --git a/types/unit/service.pp b/types/unit/service.pp
index e92bc854..63bd1e3e 100644
--- a/types/unit/service.pp
+++ b/types/unit/service.pp
@@ -7,6 +7,7 @@
     Optional['AmbientCapabilities']       => Variant[Pattern[/^CAP_[A-Z_]+$/],Array[Pattern[/^CAP_[A-Z_]+$/],1]],
     Optional['User']                      => String[1],
     Optional['Group']                     => String[1],
+    Optional['WorkingDirectory']          => String[0],
     Optional['Type']                      => Enum['simple', 'exec', 'forking', 'oneshot', 'dbus', 'notify', 'idle'],
     Optional['ExitType']                  => Enum['main', 'cgroup'],
     Optional['RemainAfterExit']           => Boolean,