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-rw-r--r--doc/manual/local.mk4
1 files changed, 2 insertions, 2 deletions
diff --git a/doc/manual/local.mk b/doc/manual/local.mk
index 0f5bfcdad24a..8511e83599cd 100644
--- a/doc/manual/local.mk
+++ b/doc/manual/local.mk
@@ -9,8 +9,8 @@ XSLTPROC = $(xsltproc) --nonet $(xmlflags) \
   --param contrib.inline.enabled 0 \
   --stringparam generate.toc "book toc"
 
-docbookxsl ?= http://docbook.sourceforge.net/release/xsl-ns/1.78.1
-docbookrng ?= http://docbook.org/xml/5.0/rng/docbook.rng
+docbookxsl = http://docbook.sourceforge.net/release/xsl-ns/1.78.1
+docbookrng = http://docbook.org/xml/5.0/rng/docbook.rng
 
 MANUAL_SRCS := $(call rwildcard, $(d), *.xml)