#if defined(__SUNPRO_C)
# define _KERNEL
# include <atomic.h>
-# if defined(_INT64_TYPE)
+# if SIZEOF_SIZE_T == 8
# define atomic_add_size(X, Y) atomic_add_64((X), (Y))
# define atomic_add_size_nv(X, Y) atomic_add_64((X), (Y))
# define atomic_dec_size(X, Y) atomic_add_64((X), (Y))