diff --git a/sys/netlink/netlink_snl.h b/sys/netlink/netlink_snl.h
--- a/sys/netlink/netlink_snl.h
+++ b/sys/netlink/netlink_snl.h
@@ -31,6 +31,12 @@
  * Simple Netlink Library
  */
 
+#include <sys/param.h>
+#include <sys/socket.h>
+
+#include <netlink/netlink.h>
+#include <netlink/netlink_bitset.h>
+
 #include <assert.h>
 #include <errno.h>
 #include <stdalign.h>
@@ -41,11 +47,6 @@
 #include <string.h>
 #include <unistd.h>
 
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netlink/netlink.h>
-#include <netlink/netlink_bitset.h>
-
 #define _roundup2(x, y)         (((x)+((y)-1))&(~((y)-1)))
 
 #define NETLINK_ALIGN_SIZE      sizeof(uint32_t)
@@ -68,8 +69,6 @@
 		((char *)NLA_NEXT(_attr) <= _NLA_END(_start, _len));	\
 		_attr =  NLA_NEXT(_attr))
 
-#define	NL_ARRAY_LEN(_a)	(sizeof(_a) / sizeof((_a)[0]))
-
 struct linear_buffer {
 	char			*base;	/* Base allocated memory pointer */
 	uint32_t		offset;	/* Currently used offset */
@@ -166,8 +165,8 @@
 	.out_size = _sz_out,						\
 	.fp = &((_fp)[0]),						\
 	.np = &((_np)[0]),						\
-	.fp_size = NL_ARRAY_LEN(_fp),					\
-	.np_size = NL_ARRAY_LEN(_np),					\
+	.fp_size = nitems(_fp),						\
+	.np_size = nitems(_np),						\
 	.cb_post = _cb,							\
 }
 
@@ -179,7 +178,7 @@
 	.in_hdr_size = _sz_h_in,					\
 	.out_size = _sz_out,						\
 	.fp = &((_fp)[0]),						\
-	.fp_size = NL_ARRAY_LEN(_fp),					\
+	.fp_size = nitems(_fp),						\
 	.cb_post = _cb,							\
 }
 
@@ -190,7 +189,7 @@
 static const struct snl_hdr_parser _name = {				\
 	.out_size = _sz_out,						\
 	.np = &((_np)[0]),						\
-	.np_size = NL_ARRAY_LEN(_np),					\
+	.np_size = nitems(_np),						\
 	.cb_post = _cb,							\
 }
 
@@ -418,7 +417,7 @@
 		}
 	}
 }
-#define	SNL_VERIFY_PARSERS(_p)	snl_verify_parsers((_p), NL_ARRAY_LEN(_p))
+#define	SNL_VERIFY_PARSERS(_p)	snl_verify_parsers((_p), nitems(_p))
 
 static const struct snl_attr_parser *
 find_parser(const struct snl_attr_parser *ps, int pslen, int key)