diff --git a/activesupport/lib/active_support/json/backends/yaml.rb b/activesupport/lib/active_support/json/backends/yaml.rb
index c7ed931c1b..b1dd2a8107 100644
--- a/activesupport/lib/active_support/json/backends/yaml.rb
+++ b/activesupport/lib/active_support/json/backends/yaml.rb
@@ -54,7 +54,9 @@ module ActiveSupport
               json.gsub(/\\([\\\/]|u[[:xdigit:]]{4})/) do
                 ustr = $1
                 if ustr.start_with?('u')
-                  [ustr[1..-1].to_i(16)].pack("U")
+                  char = [ustr[1..-1].to_i(16)].pack("U")
+                  # "\n" needs extra escaping due to yaml formatting
+                  char == "\n" ? "\\n" : char
                 elsif ustr == '\\'
                   '\\\\'
                 else
@@ -75,7 +77,9 @@ module ActiveSupport
                 chunk.gsub!(/\\([\\\/]|u[[:xdigit:]]{4})/) do
                   ustr = $1
                   if ustr.start_with?('u')
-                    [ustr[1..-1].to_i(16)].pack("U")
+                    char = [ustr[1..-1].to_i(16)].pack("U")
+                    # "\n" needs extra escaping due to yaml formatting
+                    char == "\n" ? "\\n" : char
                   elsif ustr == '\\'
                     '\\\\'
                   else
diff --git a/activesupport/test/json/decoding_test.rb b/activesupport/test/json/decoding_test.rb
index a0beb97537..613c7531d9 100644
--- a/activesupport/test/json/decoding_test.rb
+++ b/activesupport/test/json/decoding_test.rb
@@ -41,7 +41,11 @@ class TestJSONDecoding < ActiveSupport::TestCase
       [{'d' => Date.new(1970, 1, 1), 's' => ' escape'},{'d' => Date.new(1970, 1, 1), 's' => ' escape'}],
     %q([{"d":"1970-01-01","s":"http:\/\/example.com"},{"d":"1970-01-01","s":"http:\/\/example.com"}]) =>
       [{'d' => Date.new(1970, 1, 1), 's' => 'http://example.com'},
-       {'d' => Date.new(1970, 1, 1), 's' => 'http://example.com'}]
+       {'d' => Date.new(1970, 1, 1), 's' => 'http://example.com'}],
+    # tests escaping of "\n" char with Yaml backend
+    %q("\n")  => "\n",
+    %q("\u000a") => "\n",
+    %q({"a":"Line1\u000aLine2"}) => {"a"=>"Line1\nLine2"}
   }
 
   # load the default JSON backend