--- a/debian/rules	2020-11-27 09:47:43.994172799 +0000
--- b/debian/rules	2020-11-27 09:54:41.896380138 +0000
@@ -4,7 +4,8 @@
 export DEB_BUILD_MAINT_OPTIONS = hardening=+all
 export DEB_CFLAGS_MAINT_APPEND = -Wall -pedantic
 export DEB_LDFLAGS_MAINT_APPEND = -Wl,--as-needed
-include /usr/share/dpkg/buildflags.mk
+include /usr/share/dpkg/default.mk
+export AMAVISD_MILTER_VERSION = $(DEB_VERSION)
 
 %:
 	dh $@