diff --git a/spec/type_aliases/systemd_servicelimits_spec.rb b/spec/type_aliases/systemd_servicelimits_spec.rb
index 97d5db5e..95226e51 100644
--- a/spec/type_aliases/systemd_servicelimits_spec.rb
+++ b/spec/type_aliases/systemd_servicelimits_spec.rb
@@ -3,11 +3,14 @@
 require 'spec_helper'
 
 describe 'Systemd::ServiceLimits' do
+  it { is_expected.to allow_value({ 'LimitMEMLOCK' => '100:100K' }) }
+
   it { is_expected.to allow_value({ 'MemoryAccounting' => true }) }
 
   it {
     is_expected.to allow_value(
       {
+        'MemoryLow' => '100',
         'MemoryMin' => '10%',
         'MemoryHigh' => '8G',
         'MemoryMax' => 'infinity'
diff --git a/types/servicelimits.pp b/types/servicelimits.pp
index 7a7e6377..d158c929 100644
--- a/types/servicelimits.pp
+++ b/types/servicelimits.pp
@@ -2,18 +2,18 @@
 type Systemd::ServiceLimits = Struct[
   {
     Optional['LimitCPU']            => Pattern['^\d+(s|m|h|d|w|M|y)?(:\d+(s|m|h|d|w|M|y)?)?$'],
-    Optional['LimitFSIZE']          => Pattern['^(infinity|((\d+(K|M|G|T|P|E)(:\d+(K|M|G|T|P|E))?)))$'],
-    Optional['LimitDATA']           => Pattern['^(infinity|((\d+(K|M|G|T|P|E)(:\d+(K|M|G|T|P|E))?)))$'],
-    Optional['LimitSTACK']          => Pattern['^(infinity|((\d+(K|M|G|T|P|E)(:\d+(K|M|G|T|P|E))?)))$'],
-    Optional['LimitCORE']           => Pattern['^(infinity|((\d+(K|M|G|T|P|E)(:\d+(K|M|G|T|P|E))?)))$'],
-    Optional['LimitRSS']            => Pattern['^(infinity|((\d+(K|M|G|T|P|E)(:\d+(K|M|G|T|P|E))?)))$'],
+    Optional['LimitFSIZE']          => Pattern['^(infinity|((\d+(K|M|G|T|P|E)?(:\d+(K|M|G|T|P|E)?)?)))$'],
+    Optional['LimitDATA']           => Pattern['^(infinity|((\d+(K|M|G|T|P|E)?(:\d+(K|M|G|T|P|E)?)?)))$'],
+    Optional['LimitSTACK']          => Pattern['^(infinity|((\d+(K|M|G|T|P|E)?(:\d+(K|M|G|T|P|E)?)?)))$'],
+    Optional['LimitCORE']           => Pattern['^(infinity|((\d+(K|M|G|T|P|E)?(:\d+(K|M|G|T|P|E)?)?)))$'],
+    Optional['LimitRSS']            => Pattern['^(infinity|((\d+(K|M|G|T|P|E)?(:\d+(K|M|G|T|P|E)?)?)))$'],
     Optional['LimitNOFILE']         => Variant[Integer[-1],Pattern['^(infinity|\d+(:(infinity|\d+))?)$']],
-    Optional['LimitAS']             => Pattern['^(infinity|((\d+(K|M|G|T|P|E)(:\d+(K|M|G|T|P|E))?)))$'],
+    Optional['LimitAS']             => Pattern['^(infinity|((\d+(K|M|G|T|P|E)?(:\d+(K|M|G|T|P|E)?)?)))$'],
     Optional['LimitNPROC']          => Variant[Integer[-1],Pattern['^(infinity|\d+(:(infinity|\d+))?)$']],
-    Optional['LimitMEMLOCK']        => Pattern['^(infinity|((\d+(K|M|G|T|P|E)(:\d+(K|M|G|T|P|E))?)))$'],
+    Optional['LimitMEMLOCK']        => Pattern['^(infinity|((\d+(K|M|G|T|P|E)?(:\d+(K|M|G|T|P|E)?)?)))$'],
     Optional['LimitLOCKS']          => Integer[1],
     Optional['LimitSIGPENDING']     => Integer[1],
-    Optional['LimitMSGQUEUE']       => Pattern['^(infinity|((\d+(K|M|G|T|P|E)(:\d+(K|M|G|T|P|E))?)))$'],
+    Optional['LimitMSGQUEUE']       => Pattern['^(infinity|((\d+(K|M|G|T|P|E)?(:\d+(K|M|G|T|P|E)?)?)))$'],
     Optional['LimitNICE']           => Variant[Integer[0,40], Pattern['^(-\+([0-1]?[0-9]|20))|([0-3]?[0-9]|40)$']],
     Optional['LimitRTPRIO']         => Integer[0],
     Optional['LimitRTTIME']         => Pattern['^\d+(ms|s|m|h|d|w|M|y)?(:\d+(ms|s|m|h|d|w|M|y)?)?$'],
@@ -22,11 +22,11 @@
     Optional['StartupCPUShares']    => Integer[2,262144],
     Optional['CPUQuota']            => Pattern['^([1-9][0-9]*)%$'],
     Optional['MemoryAccounting']    => Boolean,
-    Optional['MemoryLow']           => Pattern['\A(infinity|\d+(K|M|G|T|%)(:\d+(K|M|G|T|%))?)\z'],
-    Optional['MemoryMin']           => Pattern['\A(infinity|\d+(K|M|G|T|%)(:\d+(K|M|G|T|%))?)\z'],
-    Optional['MemoryHigh']          => Pattern['\A(infinity|\d+(K|M|G|T|%)(:\d+(K|M|G|T|%))?)\z'],
-    Optional['MemoryMax']           => Pattern['\A(infinity|\d+(K|M|G|T|%)(:\d+(K|M|G|T|%))?)\z'],
-    Optional['MemoryLimit']         => Pattern['\A(infinity|\d+(K|M|G|T|%)(:\d+(K|M|G|T|%))?)\z'],
+    Optional['MemoryLow']           => Pattern['\A(infinity|\d+(K|M|G|T|%)?(:\d+(K|M|G|T|%)?)?)\z'],
+    Optional['MemoryMin']           => Pattern['\A(infinity|\d+(K|M|G|T|%)?(:\d+(K|M|G|T|%)?)?)\z'],
+    Optional['MemoryHigh']          => Pattern['\A(infinity|\d+(K|M|G|T|%)?(:\d+(K|M|G|T|%)?)?)\z'],
+    Optional['MemoryMax']           => Pattern['\A(infinity|\d+(K|M|G|T|%)?(:\d+(K|M|G|T|%)?)?)\z'],
+    Optional['MemoryLimit']         => Pattern['\A(infinity|\d+(K|M|G|T|%)?(:\d+(K|M|G|T|%)?)?)\z'],
     Optional['TasksAccounting']     => Boolean,
     Optional['TasksMax']            => Variant[Integer[1],Pattern['^(infinity|([1-9][0-9]?$|^100)%)$']],
     Optional['IOAccounting']        => Boolean,