diff --git a/data/Makefile.inc b/data/Makefile.inc
index 8aba2ac03b..a274bef4f8 100644
--- a/data/Makefile.inc
+++ b/data/Makefile.inc
@@ -1,2 +1,2 @@
-WEBBASE=	/data
+WEBBASE?=	/data
 SGMLOPTS+=	-links -hdr ${.CURDIR}/../doc.hdr -ftr ${.CURDIR}/../doc.ftr
diff --git a/en/Makefile.inc b/en/Makefile.inc
index 8aba2ac03b..a274bef4f8 100644
--- a/en/Makefile.inc
+++ b/en/Makefile.inc
@@ -1,2 +1,2 @@
-WEBBASE=	/data
+WEBBASE?=	/data
 SGMLOPTS+=	-links -hdr ${.CURDIR}/../doc.hdr -ftr ${.CURDIR}/../doc.ftr