diff --git a/include/isam.cpp b/include/isam.cpp
index f96581e2d..dd5af3336 100755
--- a/include/isam.cpp
+++ b/include/isam.cpp
@@ -1774,7 +1774,7 @@ void TExternisamfile::init(const char* name, bool exclusive, bool index)
 int TExternisamfile::open(bool exclusive, bool index)
 {
   _isam_handle = prefix().open_isamfile(_logicnum, _name, exclusive, index);
-   if (_isam_handle > 0)
+  if (_isam_handle > 0)
   {                       
     if (prefix().get_recdes(_logicnum).NKeys <= 0)        
       fatal_box("Il file %d (%s) e' senza indici", num(), (const char*)filename());
@@ -1807,7 +1807,10 @@ int TExternisamfile::close()
 }
 
 int TExternisamfile::zap()
-{                          
+{                       
+  RecDes* rd = new RecDes;
+  memcpy(rd, curr().rec_des(), sizeof(RecDes));
+
   int err = prefix().close_isamfile(_isam_handle);
   if (err == NOERR)
   {
@@ -1815,10 +1818,12 @@ int TExternisamfile::zap()
     if (err == NOERR)
     {
       TRecnotype peod;
-      err = DB_packindex(TRUE, _name, curr().rec_des(), &peod, FALSE);
+      err = DB_packindex(TRUE, _name, rd, &peod, FALSE);
     }       
 	  _isam_handle = prefix().open_isamfile(_logicnum, _name);
   }
+
+  delete rd;
   return err;
 }