diff --git a/batman-adv/Makefile b/batman-adv/Makefile
index 967965e..db4d8b0 100644
--- a/batman-adv/Makefile
+++ b/batman-adv/Makefile
@@ -3,12 +3,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=batman-adv
-PKG_VERSION:=2021.3
+PKG_VERSION:=2021.4
 PKG_RELEASE:=$(AUTORELEASE)
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://downloads.open-mesh.org/batman/releases/batman-adv-$(PKG_VERSION)
-PKG_HASH:=b24deec9baee786ca91085e32f7e09d4cc94f965ae71c9560895f82ec1cc906b
+PKG_HASH:=cff7a2f160045fd0dbf1f1cd7e35e93bf489e81cb8b9501b3756daa391f3eb1b
 PKG_EXTMOD_SUBDIRS:=net/batman-adv
 
 PKG_MAINTAINER:=Simon Wunderlich <sw@simonwunderlich.de>
diff --git a/batman-adv/src/compat-hacks.h b/batman-adv/src/compat-hacks.h
index 0b8b2e1..ddd8671 100644
--- a/batman-adv/src/compat-hacks.h
+++ b/batman-adv/src/compat-hacks.h
@@ -112,6 +112,13 @@ static inline void batadv_dev_hold(struct net_device *dev)
 }
 #define dev_hold batadv_dev_hold
 
+static inline void batadv_eth_hw_addr_set(struct net_device *dev,
+					  const u8 *addr)
+{
+	ether_addr_copy(dev->dev_addr, addr);
+}
+#define eth_hw_addr_set batadv_eth_hw_addr_set
+
 #endif /* LINUX_VERSION_IS_LESS(5, 15, 0) */
 
 /* <DECLARE_EWMA> */