diff -r b83392e8cd66 -r 3f4e5a50733e master/slave.c
--- a/master/slave.c	Thu Sep 20 09:44:27 2007 +0000
+++ b/master/slave.c	Thu Sep 20 10:05:37 2007 +0000
@@ -1385,6 +1385,7 @@
         return;
 
     ec_sync_clear_pdos(sync);
+    sync->alt_mapping = 1;
 }
 
 /*****************************************************************************/