diff --git a/src/lj_dispatch.c b/src/lj_dispatch.c
index 7b66be7e..57809e62 100644
--- a/src/lj_dispatch.c
+++ b/src/lj_dispatch.c
@@ -307,9 +307,9 @@ int luaJIT_setmode(lua_State *L, int idx, int mode)
       } else {
 	return 0;  /* Failed. */
       }
-      g->bc_cfunc_ext = BCINS_AD(BC_FUNCCW, 0, 0);
+      setbc_op(&g->bc_cfunc_ext, BC_FUNCCW);
     } else {
-      g->bc_cfunc_ext = BCINS_AD(BC_FUNCC, 0, 0);
+      setbc_op(&g->bc_cfunc_ext, BC_FUNCC);
     }
     break;
   default:
diff --git a/src/lj_parse.c b/src/lj_parse.c
index 6319c272..a30921af 100644
--- a/src/lj_parse.c
+++ b/src/lj_parse.c
@@ -2513,9 +2513,11 @@ static void parse_for_num(LexState *ls, GCstr *varname, BCLine line)
 */
 static int predict_next(LexState *ls, FuncState *fs, BCPos pc)
 {
-  BCIns ins = fs->bcbase[pc].ins;
+  BCIns ins;
   GCstr *name;
   cTValue *o;
+  if (pc >= fs->bclim) return 0;
+  ins = fs->bcbase[pc].ins;
   switch (bc_op(ins)) {
   case BC_MOV:
     if (bc_d(ins) >= fs->nactvar) return 0;