diff --git a/activesupport/lib/active_support/multibyte/chars.rb b/activesupport/lib/active_support/multibyte/chars.rb
index eb7f99dd71..99b974e4a7 100644
--- a/activesupport/lib/active_support/multibyte/chars.rb
+++ b/activesupport/lib/active_support/multibyte/chars.rb
@@ -168,8 +168,8 @@ module ActiveSupport #:nodoc:
       #
       # Example:
       #   'क्षि'.mb_chars.length   # => 4
-      #   'क्षि'.mb_chars.g_length # => 3
-      def g_length
+      #   'क्षि'.mb_chars.grapheme_length # => 3
+      def grapheme_length
         Unicode.unpack_graphemes(@wrapped_string).length
       end
 
diff --git a/activesupport/test/multibyte_chars_test.rb b/activesupport/test/multibyte_chars_test.rb
index 87830d57d3..e36bd22081 100644
--- a/activesupport/test/multibyte_chars_test.rb
+++ b/activesupport/test/multibyte_chars_test.rb
@@ -595,7 +595,7 @@ class MultibyteCharsExtrasTest < Test::Unit::TestCase
       else
         str = input
       end
-      assert_equal expected_length, chars(str).g_length
+      assert_equal expected_length, chars(str).grapheme_length
     end
   end