#define rx_atomic_dec_and_read(X) atomic_dec_return(X)
#define rx_atomic_sub(X, V) atomic_sub(V, X)
-#elif defined(AFS_SUN510_ENV) || (defined(AFS_SUN58_ENV) && defined(KERNEL) && !defined(UKERNEL))
+#elif defined(AFS_SUN510_ENV) || (defined(AFS_SUN5_ENV) && defined(KERNEL) && !defined(UKERNEL))
# if defined(KERNEL) && !defined(UKERNEL)
# include <sys/atomic.h>