diff --git a/libntfs/runlist.c b/libntfs/runlist.c
index 452f24a8..8cadc325 100644
--- a/libntfs/runlist.c
+++ b/libntfs/runlist.c
@@ -3,6 +3,7 @@
  *
  * Copyright (c) 2002-2004 Anton Altaparmakov
  * Copyright (c) 2002 Richard Russon
+ * Copyright (c) 2004 Yura Pakhuchiy
  *
  * This program/include file is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as published
@@ -1032,8 +1033,10 @@ s64 ntfs_rl_pread(const ntfs_volume *vol, const runlist_element *rl,
 	if (!count)
 		return count;
 	/* Seek in @rl to the run containing @pos. */
-	for (ofs = 0; rl->length && (ofs + rl->length <= pos); rl++)
-		ofs += rl->length;
+	for (ofs = 0; rl->length &&
+		(ofs + rl->length << vol->cluster_size_bits <= pos); rl++) {
+		ofs += rl->length * vol->cluster_size;
+	}
 	/* Offset in the run at which to begin reading. */
 	ofs = pos - ofs;
 	for (total = 0LL; count; rl++, ofs = 0) {
@@ -1115,8 +1118,10 @@ s64 ntfs_rl_pwrite(const ntfs_volume *vol, const runlist_element *rl,
 	if (!count)
 		return count;
 	/* Seek in @rl to the run containing @pos. */
-	for (ofs = 0; rl->length && (ofs + rl->length <= pos); rl++)
-		ofs += rl->length;
+	for (ofs = 0; rl->length &&
+		(ofs + rl->length << vol->cluster_size_bits <= pos); rl++) {
+		ofs += rl->length * vol->cluster_size;
+	}
 	/* Offset in the run at which to begin writing. */
 	ofs = pos - ofs;
 	for (total = 0LL; count; rl++, ofs = 0) {