Same var in 2 different macros isnÂ´t working

I have these 2 macros:

Code:

;----------------------------
macro call proc, [arg]
{
common
                __ARGC= 0
   if ~ arg eq
forward
              __ARGC= __ARGC+1
reverse
 if arg in <eax,ebx,ecx,edx,esi,edi,ebp,esp>
           push arg
            __ARGC= __ARGC+1
    else
                push arg
    end if
common
    end if
              call proc
   if ~ arg eq
         add sp,2*__ARGC
     end if
}
;----------------------------

;----------------------------
macro calld proc, [arg]
{
common
               __ARGC= 0
   if ~ arg eq
forward
              __ARGC= __ARGC+1
reverse
         push arg
common
  end if
              call proc
   if ~ arg eq
         add sp,4*__ARGC
     end if
}
;----------------------------

If I use the above code the 2nd macro will always mov 0 into sp! Why? If I use another name for __ARGC it is working.