diff --git a/batman-adv/Makefile b/batman-adv/Makefile
index 97f8cb1..69e800a 100644
--- a/batman-adv/Makefile
+++ b/batman-adv/Makefile
@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=batman-adv
 
 PKG_VERSION:=2018.1
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 PKG_HASH:=b866b28dbbe5c9238abbdf5abbc30fc526dea56898ce4c1bd76d5c017843048b
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
@@ -69,7 +69,8 @@ NOSTDINC_FLAGS = \
 	-I$(STAGING_DIR)/usr/include/mac80211/uapi \
 	-I$(PKG_BUILD_DIR)/include/ \
 	-include backport/backport.h \
-	-include $(PKG_BUILD_DIR)/compat-hacks.h
+	-include $(PKG_BUILD_DIR)/compat-hacks.h \
+	-DBATADV_SOURCE_VERSION=\\\"openwrt-$(PKG_VERSION)-$(PKG_RELEASE)\\\"
 
 COMPAT_SOURCES = \
 	$(if $(CONFIG_KMOD_BATMAN_ADV_MCAST),../../compat-sources/net/core/skbuff.o,) \