diff --git a/net/ieee80211/ieee80211_crypt_tkip.c b/net/ieee80211/ieee80211_crypt_tkip.c
index 4200ec5..fc1f99a 100644
--- a/net/ieee80211/ieee80211_crypt_tkip.c
+++ b/net/ieee80211/ieee80211_crypt_tkip.c
@@ -16,6 +16,7 @@
 #include <linux/random.h>
 #include <linux/skbuff.h>
 #include <linux/netdevice.h>
+#include <linux/mm.h>
 #include <linux/if_ether.h>
 #include <linux/if_arp.h>
 #include <asm/string.h>