1 files changed, 3 insertions, 3 deletions
diff --git a/mh.c b/mh.c
index eff55bd4..2c1c6343 100644
--- a/mh.c
+++ b/mh.c
@@ -1382,7 +1382,7 @@ static int mh_sync_message (CONTEXT * ctx, int msgno)
 {
   HEADER *h = ctx->hdrs[msgno];
 
-  if (h->attach_del)
+  if (h->attach_del || h->refs_changed || h->irt_changed)
     if (mh_rewrite_message (ctx, msgno) != 0)
       return -1;
 
@@ -1393,9 +1393,9 @@ static int maildir_sync_message (CONTEXT * ctx, int msgno)
 {
   HEADER *h = ctx->hdrs[msgno];
 
-  if (h->attach_del)
+  if (h->attach_del || h->refs_changed || h->irt_changed)
   {
-    /* when doing attachment deletion, fall back to the MH case. */
+    /* when doing attachment deletion/rethreading, fall back to the MH case. */
     if (mh_rewrite_message (ctx, msgno) != 0)
       return (-1);
   }