who can tell me the difference in ctypes.sizeof between Ironpython and python in using ctypes to create structure?

recently i meet a problem in using Ironpython.
     import ctypes as ct
    
    class Data(ct.LittleEndianStructure):          
        _pack_      = 2
        _fields_    = [
            
            ('a',ct.c_ubyte),
            ('b',ct.c_ubyte),
            ('c',ct.c_ubyte),
            ('d',ct.c_ushort),
            ('e',ct.c_uint),
            ('f',ct.c_ubyte),             
        ]
    if __name__ == "__main__":
        a = Data()
        print ct.sizeof(a)
as is show above.when i used this script running in python ,it prints 12.
but when running in Ironpython ,it is 14.
 in fact ,i tried it in c like that:
 
    #include<stdio.h>
    void main()
    {
    #pragma pack(2)
 struct{
  unsigned char a;
  unsigned char b;
  unsigned char c;
  unsigned short d;
  unsigned int e;
  unsigned char f;
 }A;
    #pragma pack()
 printf("%d\n",sizeof(A));
    }
it is 12.
 
can you tell me why it is and how i can crrect it in Ironpython???

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