diff --git a/ChangeLog b/ChangeLog
index 2a3a6bc96b..eea8c50745 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Tue Feb 17 18:57:13 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/resolv.rb (Resolv::DNS::Resource#==, #hash): elements
+	  returned by Kernel#instance_variables are Symbols now.
+	  [ruby-core:68128] [Bug #10857]
+
 Tue Feb 17 15:39:01 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/win32/lib/win32/registry.rb (Win32::Registry::API): use wide
diff --git a/lib/resolv.rb b/lib/resolv.rb
index 3b6e72acc2..7855c6eeb8 100644
--- a/lib/resolv.rb
+++ b/lib/resolv.rb
@@ -1666,10 +1666,10 @@ class Resolv
         return false unless self.class == other.class
         s_ivars = self.instance_variables
         s_ivars.sort!
-        s_ivars.delete "@ttl"
+        s_ivars.delete :@ttl
         o_ivars = other.instance_variables
         o_ivars.sort!
-        o_ivars.delete "@ttl"
+        o_ivars.delete :@ttl
         return s_ivars == o_ivars &&
           s_ivars.collect {|name| self.instance_variable_get name} ==
             o_ivars.collect {|name| other.instance_variable_get name}
@@ -1682,7 +1682,7 @@ class Resolv
       def hash # :nodoc:
         h = 0
         vars = self.instance_variables
-        vars.delete "@ttl"
+        vars.delete :@ttl
         vars.each {|name|
           h ^= self.instance_variable_get(name).hash
         }
diff --git a/test/resolv/test_resource.rb b/test/resolv/test_resource.rb
new file mode 100644
index 0000000000..7ec17e33e7
--- /dev/null
+++ b/test/resolv/test_resource.rb
@@ -0,0 +1,21 @@
+require 'test/unit'
+require 'resolv'
+
+class TestResolvResource < Test::Unit::TestCase
+  def setup
+    address = "192.168.0.1"
+    @name1 = Resolv::DNS::Resource::IN::A.new(address)
+    @name1.instance_variable_set(:@ttl, 100)
+    @name2 = Resolv::DNS::Resource::IN::A.new(address)
+  end
+
+  def test_equality
+    bug10857 = '[ruby-core:68128] [Bug #10857]'
+    assert_equal(@name1, @name2, bug10857)
+  end
+
+  def test_hash
+    bug10857 = '[ruby-core:68128] [Bug #10857]'
+    assert_equal(@name1.hash, @name2.hash, bug10857)
+  end
+end
diff --git a/version.h b/version.h
index c05341dbec..d9c143ed28 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.2.0"
 #define RUBY_RELEASE_DATE "2015-02-17"
-#define RUBY_PATCHLEVEL 51
+#define RUBY_PATCHLEVEL 52
 
 #define RUBY_RELEASE_YEAR 2015
 #define RUBY_RELEASE_MONTH 2