diff --git a/drivers/net/wireless/hostap/hostap_80211_tx.c b/drivers/net/wireless/hostap/hostap_80211_tx.c
index 246fac0e8001..3df3c60263d4 100644
--- a/drivers/net/wireless/hostap/hostap_80211_tx.c
+++ b/drivers/net/wireless/hostap/hostap_80211_tx.c
@@ -311,7 +311,7 @@ static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
 	local_info_t *local;
 	struct ieee80211_hdr_4addr *hdr;
 	u16 fc;
-	int hdr_len, res;
+	int prefix_len, postfix_len, hdr_len, res;
 
 	iface = netdev_priv(skb->dev);
 	local = iface->local;
@@ -337,10 +337,13 @@ static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
 	if (skb == NULL)
 		return NULL;
 
-	if ((skb_headroom(skb) < crypt->ops->extra_mpdu_prefix_len ||
-	     skb_tailroom(skb) < crypt->ops->extra_mpdu_postfix_len) &&
-	    pskb_expand_head(skb, crypt->ops->extra_mpdu_prefix_len,
-			     crypt->ops->extra_mpdu_postfix_len, GFP_ATOMIC)) {
+	prefix_len = crypt->ops->extra_mpdu_prefix_len +
+		crypt->ops->extra_msdu_prefix_len;
+	postfix_len = crypt->ops->extra_mpdu_postfix_len +
+		crypt->ops->extra_msdu_postfix_len;
+	if ((skb_headroom(skb) < prefix_len ||
+	     skb_tailroom(skb) < postfix_len) &&
+	    pskb_expand_head(skb, prefix_len, postfix_len, GFP_ATOMIC)) {
 		kfree_skb(skb);
 		return NULL;
 	}