diff --git a/sys/compat/linuxkpi/common/include/linux/skbuff.h b/sys/compat/linuxkpi/common/include/linux/skbuff.h
--- a/sys/compat/linuxkpi/common/include/linux/skbuff.h
+++ b/sys/compat/linuxkpi/common/include/linux/skbuff.h
@@ -162,7 +162,7 @@
 
 	/* "Scratch" area for layers to store metadata. */
 	/* ??? I see sizeof() operations so probably an array. */
-	uint8_t			cb[64] __aligned(CACHE_LINE_SIZE);
+	uint8_t			cb[48] __aligned(CACHE_LINE_SIZE);
 
 	struct net_device	*dev;
 	void			*sk;		/* XXX net/sock.h? */
diff --git a/sys/compat/linuxkpi/common/include/net/mac80211.h b/sys/compat/linuxkpi/common/include/net/mac80211.h
--- a/sys/compat/linuxkpi/common/include/net/mac80211.h
+++ b/sys/compat/linuxkpi/common/include/net/mac80211.h
@@ -736,7 +736,7 @@
 	uint8_t		idx;
 	uint16_t	count:5,
 			flags:11;
-};
+}__attribute__((__packed__));
 
 enum ieee80211_vif_driver_flags {
 	IEEE80211_VIF_BEACON_FILTER		= BIT(0),