--- a/net/mac80211/fils_aead.c
+++ b/net/mac80211/fils_aead.c
@@ -1,3 +1,4 @@
+#if LINUX_VERSION_IS_GEQ(4,3,0)
 /*
  * FILS AEAD for (Re)Association Request/Response frames
  * Copyright 2016, Qualcomm Atheros, Inc.
@@ -332,3 +333,4 @@ int fils_decrypt_assoc_resp(struct ieee8
 	*frame_len -= AES_BLOCK_SIZE;
 	return 0;
 }
+#endif
--- a/net/mac80211/fils_aead.h
+++ b/net/mac80211/fils_aead.h
@@ -10,10 +10,27 @@
 #ifndef FILS_AEAD_H
 #define FILS_AEAD_H
 
+#if LINUX_VERSION_IS_GEQ(4,3,0)
 int fils_encrypt_assoc_req(struct sk_buff *skb,
 			   struct ieee80211_mgd_assoc_data *assoc_data);
 int fils_decrypt_assoc_resp(struct ieee80211_sub_if_data *sdata,
 			    u8 *frame, size_t *frame_len,
 			    struct ieee80211_mgd_assoc_data *assoc_data);
+#else
+static inline
+int fils_encrypt_assoc_req(struct sk_buff *skb,
+			   struct ieee80211_mgd_assoc_data *assoc_data)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline
+int fils_decrypt_assoc_resp(struct ieee80211_sub_if_data *sdata,
+			    u8 *frame, size_t *frame_len,
+			    struct ieee80211_mgd_assoc_data *assoc_data)
+{
+	return -EOPNOTSUPP;
+}
+#endif
 
 #endif /* FILS_AEAD_H */
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -573,7 +573,9 @@ struct ieee80211_hw *ieee80211_alloc_hw_
 			   NL80211_FEATURE_MAC_ON_CREATE |
 			   NL80211_FEATURE_USERSPACE_MPM |
 			   NL80211_FEATURE_FULL_AP_CLIENT_STATE;
+#if LINUX_VERSION_IS_GEQ(4,3,0)
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_FILS_STA);
+#endif
 	wiphy_ext_feature_set(wiphy,
 			      NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211);