diff --git a/ChangeLog b/ChangeLog
index 92db48b678..72005c9a65 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,12 +1,18 @@
-Mon May 24 06:26:00 2010 Kirk haines <khaines@ruby-lang.org>
+Mon May 25 06:59:00 2010 Kirk Haines <khaines@ruby-lang.org>
 
-	* ext/openssl/ossl_config.c: Backport #484 [ruby-core:18377]; OpenSSL::Config now freezes correctly, preventing further modification.
+	* ChangeLog: Changed dates on the last commit records, because I didn't shift the day when I shifted timezones to JST.
 
-Mon May 24 05:25:00 2010 Kirk haines <khaines@ruby-lang.org>
+	* io.c: Backport #776 [ruby-core:20043]; added an ifdef _#WIN32 to rb_io_flush to do an fsync on windows.
+
+Mon May 25 06:26:00 2010 Kirk haines <khaines@ruby-lang.org>
+
+	* ext/openssl/ossl_config.c: Backport #484 [ruby-core:18377]; OpenSSL::Config now freezes correctly, preventing further modification. r28002
+
+Mon May 25 05:25:00 2010 Kirk haines <khaines@ruby-lang.org>
 
 	* lib/fileutils.rb: Backport #1700 [ruby-core:24078]; stringify group argument in #fu_get_gid before making regexp match. r28001
 
-Mon May 24 05:15:00 2010 Kirk Haines <khaines@ruby-lang.org>
+Mon May 25 05:15:00 2010 Kirk Haines <khaines@ruby-lang.org>
 
 	* configure.in: Bug #2553 [ruby-core:27380]; Add a --disable-ucontext option, for use with --enable-pthreads, to avoid performance loss from --enable-pthreads and the oodles of sigprocmask calls that normally brings. r27999
 
diff --git a/io.c b/io.c
index dc06d1062e..bb5ea9fa82 100644
--- a/io.c
+++ b/io.c
@@ -643,7 +643,9 @@ rb_io_flush(io)
     f = GetWriteFile(fptr);
 
     io_fflush(f, fptr);
-
+#ifdef _WIN32
+    fsync(fileno(f));
+#endif
     return io;
 }
 
diff --git a/version.h b/version.h
index 951f55ee20..406b677cb6 100644
--- a/version.h
+++ b/version.h
@@ -2,7 +2,7 @@
 #define RUBY_RELEASE_DATE "2010-05-25"
 #define RUBY_VERSION_CODE 186
 #define RUBY_RELEASE_CODE 20100525
-#define RUBY_PATCHLEVEL 401
+#define RUBY_PATCHLEVEL 402
 
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 8