diff --git a/packages/linux-drivers/RTL8812AU/patches/RTL8812AU-0001-fix-5-18.patch b/packages/linux-drivers/RTL8812AU/patches/RTL8812AU-0001-fix-5-18.patch
new file mode 100644
index 0000000000..443377892d
--- /dev/null
+++ b/packages/linux-drivers/RTL8812AU/patches/RTL8812AU-0001-fix-5-18.patch
@@ -0,0 +1,24 @@
+--- a/include/ieee80211.h	2022-04-25 12:34:26.110654447 +0000
++++ b/include/ieee80211.h	2022-04-25 12:34:26.110654447 +0000
+@@ -1616,18 +1616,18 @@
+ 	(((Addr[2]) & 0xff) == 0xff) && (((Addr[3]) & 0xff) == 0xff) && (((Addr[4]) & 0xff) == 0xff) && \
+ 				     (((Addr[5]) & 0xff) == 0xff))
+ #else
+-extern __inline int is_multicast_mac_addr(const u8 *addr)
++static inline int is_multicast_mac_addr(const u8 *addr)
+ {
+ 	return (addr[0] != 0xff) && (0x01 & addr[0]);
+ }
+ 
+-extern __inline int is_broadcast_mac_addr(const u8 *addr)
++static inline int is_broadcast_mac_addr(const u8 *addr)
+ {
+ 	return ((addr[0] == 0xff) && (addr[1] == 0xff) && (addr[2] == 0xff) &&   \
+ 		(addr[3] == 0xff) && (addr[4] == 0xff) && (addr[5] == 0xff));
+ }
+ 
+-extern __inline int is_zero_mac_addr(const u8 *addr)
++static inline int is_zero_mac_addr(const u8 *addr)
+ {
+ 	return ((addr[0] == 0x00) && (addr[1] == 0x00) && (addr[2] == 0x00) &&   \
+ 		(addr[3] == 0x00) && (addr[4] == 0x00) && (addr[5] == 0x00));