diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 3730dfac34..af82919268 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Fix `read_attribute_before_type_cast` to consider attribute aliases.
+
+    *Marcelo Lauxen*
+
 *   Support passing record to uniqueness validator `:conditions` callable:
 
     ```ruby
diff --git a/activerecord/lib/active_record/attribute_methods/before_type_cast.rb b/activerecord/lib/active_record/attribute_methods/before_type_cast.rb
index 52649d9271..59aa3a8b53 100644
--- a/activerecord/lib/active_record/attribute_methods/before_type_cast.rb
+++ b/activerecord/lib/active_record/attribute_methods/before_type_cast.rb
@@ -46,7 +46,10 @@ module ActiveRecord
       #   task.read_attribute_before_type_cast('completed_on') # => "2012-10-21"
       #   task.read_attribute_before_type_cast(:completed_on)  # => "2012-10-21"
       def read_attribute_before_type_cast(attr_name)
-        attribute_before_type_cast(attr_name.to_s)
+        name = attr_name.to_s
+        name = self.class.attribute_aliases[name] || name
+
+        attribute_before_type_cast(name)
       end
 
       # Returns a hash of attributes before typecasting and deserialization.
diff --git a/activerecord/test/cases/attribute_methods_test.rb b/activerecord/test/cases/attribute_methods_test.rb
index d66e37a903..f181e86570 100644
--- a/activerecord/test/cases/attribute_methods_test.rb
+++ b/activerecord/test/cases/attribute_methods_test.rb
@@ -12,6 +12,7 @@ require "models/category"
 require "models/reply"
 require "models/contact"
 require "models/keyboard"
+require "models/numeric_data"
 
 class AttributeMethodsTest < ActiveRecord::TestCase
   include InTimeZone
@@ -1087,6 +1088,11 @@ class AttributeMethodsTest < ActiveRecord::TestCase
     assert_equal "Topic::GeneratedAttributeMethods", mod.inspect
   end
 
+  test "read_attribute_before_type_cast with aliased attribute" do
+    model = NumericData.new(new_bank_balance: "abcd")
+    assert_equal "abcd", model.read_attribute_before_type_cast("new_bank_balance")
+  end
+
   private
     def new_topic_like_ar_class(&block)
       klass = Class.new(ActiveRecord::Base) do
diff --git a/activerecord/test/cases/validations/numericality_validation_test.rb b/activerecord/test/cases/validations/numericality_validation_test.rb
index 5b96d8f7ca..ffb8fd17b2 100644
--- a/activerecord/test/cases/validations/numericality_validation_test.rb
+++ b/activerecord/test/cases/validations/numericality_validation_test.rb
@@ -102,4 +102,12 @@ class NumericalityValidationTest < ActiveRecord::TestCase
 
     assert_not_predicate subject, :valid?
   end
+
+  def test_aliased_attribute
+    model_class.validates_numericality_of(:new_bank_balance, greater_or_equal_than: 0)
+
+    subject = model_class.new(new_bank_balance: "abcd")
+
+    assert_not_predicate subject, :valid?
+  end
 end
diff --git a/activerecord/test/models/numeric_data.rb b/activerecord/test/models/numeric_data.rb
index 666e1a5778..60b382cda7 100644
--- a/activerecord/test/models/numeric_data.rb
+++ b/activerecord/test/models/numeric_data.rb
@@ -7,4 +7,6 @@ class NumericData < ActiveRecord::Base
   attribute :world_population, :big_integer
   attribute :my_house_population, :big_integer
   attribute :atoms_in_universe, :big_integer
+
+  alias_attribute :new_bank_balance, :bank_balance
 end