diff --git a/ChangeLog b/ChangeLog
index 703fde5b00..7c4de075ed 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Jan  3 11:28:58 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* io.c (fptr_finalize): clear errno first.  [ruby-talk:284492]
+
 Thu Jan  3 05:02:36 2008  Tanaka Akira  <akr@fsij.org>
 
 	* enc/us_ascii.c: add us_ascii_ prefix for functions to ease
diff --git a/io.c b/io.c
index 18d651ea8f..8d8bfe172b 100644
--- a/io.c
+++ b/io.c
@@ -2169,6 +2169,7 @@ rb_io_each_byte(VALUE io)
 	    fptr->rbuf_len--;
 	    rb_yield(INT2FIX(*p & 0xff));
 	    p++;
+    errno = 0;
 	}
 	rb_io_check_readable(fptr);
 	READ_CHECK(fptr);