diff --git a/ChangeLog b/ChangeLog
index fb83f93bd8..ea8eb44e22 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,8 +1,8 @@
 Mon Mar  3 02:53:53 2014  NAKAMURA Usaku  <usa@ruby-lang.org>
 
-	* io.c (rb_io_flush_raw, rb_io_fsync): [EXPERIMENTAL] remove force
-	  syncing for Win32 to speed up IO.  this may break some tests, and
-	  they'll be fixed later.
+	* io.c (rb_io_flush_raw): [EXPERIMENTAL] remove force syncing for Win32
+	  to speed up IO.  this may break some tests, and they'll be fixed
+	  later.
 	  [ruby-core:58570] [Bug #9153]
 
 Mon Mar  3 00:17:43 2014  NAKAMURA Usaku  <usa@ruby-lang.org>
diff --git a/io.c b/io.c
index 5abf1e241d..8d78d17e05 100644
--- a/io.c
+++ b/io.c
@@ -1925,6 +1925,10 @@ rb_io_fsync(VALUE io)
 
     if (io_fflush(fptr) < 0)
         rb_sys_fail(0);
+# ifndef _WIN32
+    if ((int)rb_thread_io_blocking_region(nogvl_fsync, fptr, fptr->fd) < 0)
+	rb_sys_fail_path(fptr->pathv);
+# endif
     return INT2FIX(0);
 }
 #else