diff --git a/spec/type_aliases/fqdn_spec.rb b/spec/type_aliases/fqdn_spec.rb
index 09ed393bb..1c5f47c0e 100644
--- a/spec/type_aliases/fqdn_spec.rb
+++ b/spec/type_aliases/fqdn_spec.rb
@@ -22,6 +22,7 @@
         "\nexample",
         "\nexample\n",
         "example\n",
+        '10.10.10.10.10',
         '2001:DB8::1',
         'www www.example.com',
       ].each do |value|
diff --git a/spec/type_aliases/host_spec.rb b/spec/type_aliases/host_spec.rb
index cfd23ee26..f04e17cf0 100644
--- a/spec/type_aliases/host_spec.rb
+++ b/spec/type_aliases/host_spec.rb
@@ -24,6 +24,7 @@
         'bob@example.com',
         '%.example.com',
         '2001:0d8',
+        '10.10.10.10.10',
       ].each do |value|
         describe value.inspect do
           it { is_expected.not_to allow_value(value) }