diff --git a/lib/validates_zipcode/cldr_regex_collection.rb b/lib/validates_zipcode/cldr_regex_collection.rb
index c8587e7..f97737c 100644
--- a/lib/validates_zipcode/cldr_regex_collection.rb
+++ b/lib/validates_zipcode/cldr_regex_collection.rb
@@ -32,7 +32,7 @@ module CldrRegexpCollection
       SG: /\A\d{6}\z/,
       DZ: /\A\d{5}\z/,
       AD: /\AAD\d{3}\z/,
-      AR: /\A[A-HJ-NP-Z]{1}\d{4}([A-Z]{3})?\z/,
+      AR: /\A([A-HJ-NP-Z]{1}\d{4}([A-Z]{3})?|\d{4})\z/,
       AM: /\A(37)?\d{4}\z/,
       BH: /\A(1[0-2]|[1-9])\d{2}\z/,
       BD: /\A\d{4}\z/,
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 7bb346a..c601237 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -423,6 +423,7 @@
     valid: %w[
       C1234CHN
       C1234
+      6000
     ],
     invalid: [
       nil,