diff --git a/rigs/yaesu/ft817.c b/rigs/yaesu/ft817.c
index ead4450a6..a7f271c82 100644
--- a/rigs/yaesu/ft817.c
+++ b/rigs/yaesu/ft817.c
@@ -1068,6 +1068,7 @@ static int ft817_send_cmd(RIG *rig, int index)
         return -RIG_EINTERNAL;
     }
 
+    rig_flush(&rig->state.rigport);
     write_block(&rig->state.rigport, (char *) p->pcs[index].nseq, YAESU_CMD_LENGTH);
     return ft817_read_ack(rig);
 }