diff --git a/ru_RU.KOI8-R/share/mk/doc.local.mk b/ru_RU.KOI8-R/share/mk/doc.local.mk
new file mode 100644
index 0000000000..58817d4c71
--- /dev/null
+++ b/ru_RU.KOI8-R/share/mk/doc.local.mk
@@ -0,0 +1,3 @@
+# $FreeBSD$
+
+SP_ENCODING?=	${LANGCODE:C,^.*\.,,}