diff --git a/src/nwfilter/nwfilter_learnipaddr.c b/src/nwfilter/nwfilter_learnipaddr.c
index 7fc55a67e7..7c94fc24ce 100644
--- a/src/nwfilter/nwfilter_learnipaddr.c
+++ b/src/nwfilter/nwfilter_learnipaddr.c
@@ -38,11 +38,6 @@
 #include <net/if_arp.h>
 #include <intprops.h>
 
-// Add Linux define missing from OSX
-#ifndef ETH_ALEN
-# define ETH_ALEN       6               /* Octets in one ethernet addr   */
-#endif
-
 #include "internal.h"
 
 #include "buf.h"