diff --git a/activerecord/lib/active_record/attribute_methods.rb b/activerecord/lib/active_record/attribute_methods.rb
index c07fd67216..b3f97522c2 100644
--- a/activerecord/lib/active_record/attribute_methods.rb
+++ b/activerecord/lib/active_record/attribute_methods.rb
@@ -273,7 +273,7 @@ module ActiveRecord
     #   person = Person.create!(name: 'David Heinemeier Hansson ' * 3)
     #
     #   person.attribute_for_inspect(:name)
-    #   # => "\"David Heinemeier Hansson David Heinemeier Hansson D...\""
+    #   # => "\"David Heinemeier Hansson David Heinemeier Hansson ...\""
     #
     #   person.attribute_for_inspect(:created_at)
     #   # => "\"2012-10-22 00:15:07\""
@@ -281,7 +281,7 @@ module ActiveRecord
       value = read_attribute(attr_name)
 
       if value.is_a?(String) && value.length > 50
-        "#{value[0..50]}...".inspect
+        "#{value[0..49]}...".inspect
       elsif value.is_a?(Date) || value.is_a?(Time)
         %("#{value.to_s(:db)}")
       else
diff --git a/activerecord/test/cases/attribute_methods_test.rb b/activerecord/test/cases/attribute_methods_test.rb
index ee0150558d..170c4cd9cd 100644
--- a/activerecord/test/cases/attribute_methods_test.rb
+++ b/activerecord/test/cases/attribute_methods_test.rb
@@ -32,7 +32,7 @@ class AttributeMethodsTest < ActiveRecord::TestCase
     t.title = "The First Topic Now Has A Title With\nNewlines And More Than 50 Characters"
 
     assert_equal %("#{t.written_on.to_s(:db)}"), t.attribute_for_inspect(:written_on)
-    assert_equal '"The First Topic Now Has A Title With\nNewlines And M..."', t.attribute_for_inspect(:title)
+    assert_equal '"The First Topic Now Has A Title With\nNewlines And ..."', t.attribute_for_inspect(:title)
   end
 
   def test_attribute_present