diff --git a/libvips/foreign/dzsave.c b/libvips/foreign/dzsave.c
index 8ebd3cec..0a04810e 100644
--- a/libvips/foreign/dzsave.c
+++ b/libvips/foreign/dzsave.c
@@ -248,9 +248,30 @@ gsf_output_target_write( GsfOutput *output,
 static gboolean
 gsf_output_target_seek( GsfOutput *output, gsf_off_t offset, GSeekType whence )
 {
+#ifdef HAVE_GSF_ZIP64
+	/* No seek needed.
+	 */
+	return( FALSE );
+#else
+	GsfOutputTarget *output_target = (GsfOutputTarget *) output;
+	int stdio_whence;
+
+	switch( whence ) {
+	case G_SEEK_CUR: stdio_whence = SEEK_CUR; break;
+	case G_SEEK_END: stdio_whence = SEEK_END; break;
+	case G_SEEK_SET: stdio_whence = SEEK_SET; break;
+	default:
+		g_assert_not_reached();
+	}
+
+	if( vips_target_seek( output_target->target,
+		offset, stdio_whence ) == -1 )
+		return( FALSE );
+
 	/* This will make our parent class handle the seek.
 	 */
 	return( TRUE );
+#endif
 }
 
 static void
diff --git a/libvips/iofuncs/target.c b/libvips/iofuncs/target.c
index 995b1e0e..2cc1f2fe 100644
--- a/libvips/iofuncs/target.c
+++ b/libvips/iofuncs/target.c
@@ -569,7 +569,7 @@ vips_target_read( VipsTarget *target, void *buffer, size_t length )
  * Seeking a target sounds weird, but libtiff needs this. This method will 
  * fail for targets like pipes.
  *
- * Returns: 0 on success, -1 on error.
+ * Returns: the new seek position, -1 on error.
  */
 off_t
 vips_target_seek( VipsTarget *target, off_t position, int whence )