diff --git a/glib/goption.c b/glib/goption.c
index 2fb42e137..9f54be017 100644
--- a/glib/goption.c
+++ b/glib/goption.c
@@ -1680,11 +1680,7 @@ platform_get_argv0 (void)
 
   cmdline = (char **) realloc (cmdline, len);
 
-#ifndef nitems
-#define nitems(_a)      (sizeof((_a)) / sizeof((_a)[0]))
-#endif
-
-  if (sysctl (mib, nitems (mib), cmdline, &len, NULL, 0) == -1)
+  if (sysctl (mib, G_N_ELEMENTS (mib), cmdline, &len, NULL, 0) == -1)
     {
       g_free (cmdline);
       return NULL;