change Runeerror
diff --git a/include/utf.h b/include/utf.h
index 21fec99..e7a602d 100644
--- a/include/utf.h
+++ b/include/utf.h
@@ -11,7 +11,7 @@
 	UTFmax		= 3,		/* maximum bytes per rune */
 	Runesync	= 0x80,		/* cannot represent part of a UTF sequence (<) */
 	Runeself	= 0x80,		/* rune and UTF sequences are the same (<) */
-	Runeerror	= 0x80,		/* decoding error in UTF */
+	Runeerror	= 0xFFFD,		/* decoding error in UTF */
 };
 
 /* Edit .+1,/^$/ | cfn $PLAN9/src/lib9/utf/?*.c | grep -v static |grep -v __ */