diff --git a/src/ChangeLog b/src/ChangeLog
index a9a92e0cbab..43b8f4b76f7 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2013-02-10  Dmitry Antipov  <dmantipov@yandex.ru>
+
+	* syntax.c (scan_sexps_forward): Fix byte position calculation
+	Bug#13664 (a.k.a Bug#13667) introduced with 2013-02-08 change.
+
 2013-02-10  Paul Eggert  <eggert@cs.ucla.edu>
 
 	* fileio.c (Fexpand_file_name): Omit confusing pointer comparison
diff --git a/src/syntax.c b/src/syntax.c
index 42500b0cb76..390d732944d 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -3278,6 +3278,7 @@ do { prev_from = from;				\
 
  stop:   /* Here if stopping before start of sexp. */
   from = prev_from;    /* We have just fetched the char that starts it; */
+  from_byte = prev_from_byte;
   goto done; /* but return the position before it. */
 
  endquoted: