diff --git a/include/multirec.cpp b/include/multirec.cpp
index 4e2bd2b0a..0165720b7 100755
--- a/include/multirec.cpp
+++ b/include/multirec.cpp
@@ -87,6 +87,7 @@ int TMultiple_rectype::write_rewrite(TBaseisamfile & f, bool re) const
   else
   {
     // write:
+    ((TMultiple_rectype *)this)->renum_key();
     if (_nuovo)
     {
       do