diff --git a/libtransmission/torrent.c b/libtransmission/torrent.c
index 77e80273d..599123991 100644
--- a/libtransmission/torrent.c
+++ b/libtransmission/torrent.c
@@ -1239,15 +1239,19 @@ tr_torrentSetFileDL( tr_torrent_t  * tor,
 }
 
 void
-tr_torrentSetFileDLs ( tr_torrent_t * tor, const uint8_t * enabled )
+tr_torrentSetFileDLs ( tr_torrent_t   * tor,
+                       int            * files,
+                       int              fileCount,
+                       int              do_download )
 {
     int i, j;
+    const int dnd = !do_download;
 
     tr_torrentWriterLock( tor );
 
-    for( i=0; i<tor->info.fileCount; ++i ) {
-        const int dnd = !enabled[i];
-        tr_file_t * file = &tor->info.files[i];
+    for( i=0; i<fileCount; ++i ) {
+        const int fileIndex = files[i];
+        tr_file_t * file = &tor->info.files[fileIndex];
         file->dnd = dnd;
         for( j=file->firstPiece; j<=file->lastPiece; ++j )
             tor->info.pieces[j].dnd = dnd;
diff --git a/libtransmission/transmission.h b/libtransmission/transmission.h
index e503719fa..9d13b482e 100644
--- a/libtransmission/transmission.h
+++ b/libtransmission/transmission.h
@@ -236,9 +236,11 @@ tr_priority_t tr_torrentGetFilePriority( const tr_torrent_t *, int file );
 /* returns true if the file's `download' flag is set */
 int tr_torrentGetFileDL( const tr_torrent_t *, int file );
 
-/* enabled should be an array of tor->info.fileCount bytes,
- * each holding a nonzero value if the file is to be downloaded */
-void tr_torrentSetFileDLs ( tr_torrent_t *, const uint8_t * enabled );
+/* set a batch of files to be downloaded or not. */
+void tr_torrentSetFileDLs ( tr_torrent_t   * tor,
+                            int            * files,
+                            int              fileCount,
+                            int              do_download );
 
 /* single-file form of tr_torrentSetFileDLs */
 void tr_torrentSetFileDL( tr_torrent_t *, int file, int do_download );