Index: generic/nsf.c
===================================================================
diff -u -rbdfa0fc0d417405db109b2099da713dc4a0daa6f -r6a4df824c3113d68b07a7a2d9d3e45e371e68641
--- generic/nsf.c	(.../nsf.c)	(revision bdfa0fc0d417405db109b2099da713dc4a0daa6f)
+++ generic/nsf.c	(.../nsf.c)	(revision 6a4df824c3113d68b07a7a2d9d3e45e371e68641)
@@ -796,7 +796,7 @@
 
   memcpy(pcPtr->objv + from,  source, sizeof(Tcl_Obj *) * (size_t)elts);
   memset(pcPtr->flags + from, 0,      sizeof(int) * (size_t)elts);
-  pcPtr->objc += elts;
+  pcPtr->objc += (int)elts;
 
   /*NsfPrintObjv("AFTER:  ", pcPtr->objc, pcPtr->full_objv);*/
 }