diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index bf9f26234662..1a6cbbb5a17d 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -52,7 +52,7 @@ struct ieee80211_mesh_fast_tx;
 
 /* Required encryption head and tailroom */
 #define IEEE80211_ENCRYPT_HEADROOM 8
-#define IEEE80211_ENCRYPT_TAILROOM 18
+#define IEEE80211_ENCRYPT_TAILROOM 26 /* current max: GMAC/CMAC-256 MME */
 
 /* power level hasn't been configured (or set to automatic) */
 #define IEEE80211_UNSET_POWER_LEVEL	INT_MIN