diff --git a/include/runlist.h b/include/runlist.h
index e6e1a3ed..61069bce 100644
--- a/include/runlist.h
+++ b/include/runlist.h
@@ -71,7 +71,7 @@ extern int ntfs_write_significant_bytes(s8 *dst, const s8 *dst_max,
 extern int ntfs_mapping_pairs_build(const ntfs_volume *vol, s8 *dst,
 		const int dst_len, const runlist_element *rl);
 
-extern int ntfs_rl_truncate(runlist_element *rl, const VCN start_vcn);
+extern int ntfs_rl_truncate(runlist **rl, const VCN start_vcn);
 
 #endif /* defined _NTFS_RUNLIST_H */
 
diff --git a/libntfs/attrib.c b/libntfs/attrib.c
index 63b5d864..250efa18 100644
--- a/libntfs/attrib.c
+++ b/libntfs/attrib.c
@@ -2110,7 +2110,7 @@ static int ntfs_non_resident_attr_shrink(ntfs_attr *na, const s64 newsize)
 	}
 
 	/* Truncate the runlist itself. */
-	if (ntfs_rl_truncate(na->rl, first_free_vcn)) {
+	if (ntfs_rl_truncate(&na->rl, first_free_vcn)) {
 		// FIXME: Eeek! We need rollback! (AIA)
 		fprintf(stderr, "%s(): Eeek! Run list truncation failed. "
 				"Leaving inconsistent metadata!\n",
diff --git a/libntfs/runlist.c b/libntfs/runlist.c
index e0c5a21d..85d1ec3f 100644
--- a/libntfs/runlist.c
+++ b/libntfs/runlist.c
@@ -1309,15 +1309,18 @@ err_out:
 
 /**
  * ntfs_rl_truncate - truncate a runlist starting at a specified vcn
- * @rl:		runlist to truncate
+ * @rl:		address of runlist to truncate
  * @start_vcn:	first vcn which should be cut off
  *
- * Truncate the runlist @rl starting at vcn @start_vcn as well as the memory
+ * Truncate the runlist *@rl starting at vcn @start_vcn as well as the memory
  * buffer holding the runlist.
  *
  * Return 0 on success and -1 on error with errno set to the error code.
+ *
+ * NOTE: @rl is the address of the runlist. We need the address so we can
+ * modify the pointer to the runlist with the new, reallocated memory buffer.
  */
-int ntfs_rl_truncate(runlist_element *rl, const VCN start_vcn)
+int ntfs_rl_truncate(runlist **rl, const VCN start_vcn)
 {
 	errno = ENOTSUP;
 	return -1;