diff --git a/ChangeLog b/ChangeLog
index ca70f99462..80eae866e2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Fri Jun 13 11:56:28 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* lib/benchmark.rb (Benchmark::realtime): make Benchmark#realtime
+	  a bit faster.  a patch from Alexander Dymo <dymo@ukrpost.ua> in
+	  [ruby-core:15337].
+
 Fri Jun 13 11:42:52 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* io.c (rb_open_file): should check NUL in path.
diff --git a/lib/benchmark.rb b/lib/benchmark.rb
index ea62dcd208..0120caf155 100644
--- a/lib/benchmark.rb
+++ b/lib/benchmark.rb
@@ -304,7 +304,10 @@ module Benchmark
   # Returns the elapsed real time used to execute the given block.
   #
   def realtime(&blk) # :yield:
-    Benchmark::measure(&blk).real
+    r0 = Time.now
+    yield
+    r1 = Time.now
+    r1.to_f - r0.to_f
   end
 
 
diff --git a/version.h b/version.h
index 9bd1f61794..f6dac2c2f7 100644
--- a/version.h
+++ b/version.h
@@ -2,7 +2,7 @@
 #define RUBY_RELEASE_DATE "2008-06-13"
 #define RUBY_VERSION_CODE 185
 #define RUBY_RELEASE_CODE 20080613
-#define RUBY_PATCHLEVEL 169
+#define RUBY_PATCHLEVEL 170
 
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 8