diff --git a/nasal_codegen.h b/nasal_codegen.h
index ca58065..6056b4c 100644
--- a/nasal_codegen.h
+++ b/nasal_codegen.h
@@ -6,6 +6,7 @@ enum op_code
     op_nop,      // do nothing and end the vm main loop
     op_intg,     // global scope size
     op_intl,     // local scope size
+    op_offset,   // offset of local scope of function in closure
     op_loadg,    // load global symbol value
     op_loadl,    // load local symbol value
     op_pnum,     // push constant number to the stack
@@ -75,6 +76,7 @@ struct
     {op_nop,      "nop   "},
     {op_intg,     "intg  "},
     {op_intl,     "intl  "},
+    {op_offset,   "offset"},
     {op_loadg,    "loadg "},
     {op_loadl,    "loadl "},
     {op_pnum,     "pnum  "},
@@ -373,6 +375,10 @@ void nasal_codegen::func_gen(nasal_ast& ast)
     // this symbol's index will be 0
     if(local.size()==1)
         add_sym("me");
+    
+    gen(op_offset,0);
+    for(auto i:local)
+        exec_code.back().num+=i.size();
     // generate parameter list
     for(auto tmp:ast.get_children()[0].get_children())
     {
diff --git a/nasal_vm.h b/nasal_vm.h
index e5f3be1..73114d3 100644
--- a/nasal_vm.h
+++ b/nasal_vm.h
@@ -21,6 +21,7 @@ private:
     void opr_nop();
     void opr_intg();
     void opr_intl();
+    void opr_offset();
     void opr_loadg();
     void opr_loadl();
     void opr_pnum();
@@ -146,15 +147,19 @@ void nasal_vm::opr_nop()
 }
 void nasal_vm::opr_intg()
 {
-    gc.global.resize(exec_code[pc].num);
+    gc.global.resize(exec_code[pc].num,gc.nil_addr);
     return;
 }
 void nasal_vm::opr_intl()
 {
-    (*stack_top)->ptr.func->closure.resize(exec_code[pc].num);
+    (*stack_top)->ptr.func->closure.resize(exec_code[pc].num,gc.nil_addr);
     (*stack_top)->ptr.func->closure[0]=gc.nil_addr;// me
     return;
 }
+void nasal_vm::opr_offset()
+{
+    (*stack_top)->ptr.func->offset=exec_code[pc].num;
+}
 void nasal_vm::opr_loadg()
 {
     gc.global[exec_code[pc].num]=*stack_top--;
@@ -209,8 +214,7 @@ void nasal_vm::opr_newf()
     if(!gc.local.empty())
         val->ptr.func->closure=gc.local.back();
     else
-        val->ptr.func->closure.push_back(gc.nil_addr);
-    val->ptr.func->offset=val->ptr.func->closure.size();
+        val->ptr.func->closure.push_back(gc.nil_addr);// me
     *(++stack_top)=val;
     return;
 }
@@ -868,6 +872,7 @@ void nasal_vm::run()
         &nasal_vm::opr_nop,
         &nasal_vm::opr_intg,
         &nasal_vm::opr_intl,
+        &nasal_vm::opr_offset,
         &nasal_vm::opr_loadg,
         &nasal_vm::opr_loadl,
         &nasal_vm::opr_pnum,