diff --git a/post/lib_powerpc/three.c b/post/lib_powerpc/three.c
index 7f8c1e2..4391386 100644
--- a/post/lib_powerpc/three.c
+++ b/post/lib_powerpc/three.c
@@ -155,8 +155,7 @@
 	0x40
     },
 };
-static unsigned int cpu_post_three_size =
-    sizeof (cpu_post_three_table) / sizeof (struct cpu_post_three_s);
+static unsigned int cpu_post_three_size = ARRAY_SIZE(cpu_post_three_table);
 
 int cpu_post_test_three (void)
 {