diff --git a/ChangeLog b/ChangeLog
index 45a21b6f5e..c4cc5e45d2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Apr 13 20:12:26 2011  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
+
+	* io.c (rb_io_fdatasync): remove unused variable.
+
 Tue Apr 12 20:54:12 2011  Tanaka Akira  <akr@fsij.org>
 
 	* include/ruby/st.h: parenthesize macro arguments.
diff --git a/io.c b/io.c
index 46845eb58b..a958b0f276 100644
--- a/io.c
+++ b/io.c
@@ -1423,7 +1423,6 @@ static VALUE
 rb_io_fdatasync(VALUE io)
 {
     rb_io_t *fptr;
-    int saved_errno = 0;
 
     io = GetWriteIO(io);
     GetOpenFile(io, fptr);