diff --git a/activemodel/CHANGELOG.md b/activemodel/CHANGELOG.md
index 8f892ea3a709f81dfa84836e45cfd020c9135641..68cc874ca3846b89ea5d5e7c190c85be448ab037 100644
--- a/activemodel/CHANGELOG.md
+++ b/activemodel/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Add plural and singular form for length validator's default messages
+
+    *Abd ar-Rahman Hamid*
+
 *   Introduce `validate` as an alias for `valid?`.
 
     This is more intuitive when you want to run validations but don't care about
diff --git a/activemodel/lib/active_model/locale/en.yml b/activemodel/lib/active_model/locale/en.yml
index 540e8132d3253cbdad528f132fe5c4d40d047f2d..bf07945fe18ff681994d90631d9d9f0ce0f34d7d 100644
--- a/activemodel/lib/active_model/locale/en.yml
+++ b/activemodel/lib/active_model/locale/en.yml
@@ -14,9 +14,15 @@ en:
       empty: "can't be empty"
       blank: "can't be blank"
       present: "must be blank"
-      too_long: "is too long (maximum is %{count} characters)"
-      too_short: "is too short (minimum is %{count} characters)"
-      wrong_length: "is the wrong length (should be %{count} characters)"
+      too_long:
+        one: "is too long (maximum is 1 character)"
+        other: "is too long (maximum is %{count} characters)" 
+      too_short:
+        one: "is too short (minimum is 1 character)"
+        other: "is too short (minimum is %{count} characters)"
+      wrong_length:
+        one: "is the wrong length (should be 1 character)"
+        other: "is the wrong length (should be %{count} characters)"
       not_a_number: "is not a number"
       not_an_integer: "must be an integer"
       greater_than: "must be greater than %{count}"
diff --git a/activemodel/test/cases/validations/i18n_generate_message_validation_test.rb b/activemodel/test/cases/validations/i18n_generate_message_validation_test.rb
index 93600c587a28c1ef376534f5f0f2e667ed7e68ec..3eeb80a48b23b7581be7d4fd35f24246726c8314 100644
--- a/activemodel/test/cases/validations/i18n_generate_message_validation_test.rb
+++ b/activemodel/test/cases/validations/i18n_generate_message_validation_test.rb
@@ -72,28 +72,40 @@ def test_generate_message_blank_with_custom_message
   end
 
   # validates_length_of: generate_message(attr, :too_long, message: custom_message, count: option_value.end)
-  def test_generate_message_too_long_with_default_message
+  def test_generate_message_too_long_with_default_message_plural
     assert_equal "is too long (maximum is 10 characters)", @person.errors.generate_message(:title, :too_long, count: 10)
   end
 
+  def test_generate_message_too_long_with_default_message_singular
+    assert_equal "is too long (maximum is 1 character)", @person.errors.generate_message(:title, :too_long, count: 1)
+  end
+
   def test_generate_message_too_long_with_custom_message
     assert_equal 'custom message 10', @person.errors.generate_message(:title, :too_long, message: 'custom message %{count}', count: 10)
   end
 
   # validates_length_of: generate_message(attr, :too_short, default: custom_message, count: option_value.begin)
-  def test_generate_message_too_short_with_default_message
+  def test_generate_message_too_short_with_default_message_plural
     assert_equal "is too short (minimum is 10 characters)", @person.errors.generate_message(:title, :too_short, count: 10)
   end
 
+  def test_generate_message_too_short_with_default_message_singular
+    assert_equal "is too short (minimum is 1 character)", @person.errors.generate_message(:title, :too_short, count: 1)
+  end
+
   def test_generate_message_too_short_with_custom_message
     assert_equal 'custom message 10', @person.errors.generate_message(:title, :too_short, message: 'custom message %{count}', count: 10)
   end
 
   # validates_length_of: generate_message(attr, :wrong_length, message: custom_message, count: option_value)
-  def test_generate_message_wrong_length_with_default_message
+  def test_generate_message_wrong_length_with_default_message_plural
     assert_equal "is the wrong length (should be 10 characters)", @person.errors.generate_message(:title, :wrong_length, count: 10)
   end
 
+  def test_generate_message_wrong_length_with_default_message_singular
+    assert_equal "is the wrong length (should be 1 character)", @person.errors.generate_message(:title, :wrong_length, count: 1)
+  end
+
   def test_generate_message_wrong_length_with_custom_message
     assert_equal 'custom message 10', @person.errors.generate_message(:title, :wrong_length, message: 'custom message %{count}', count: 10)
   end