--- a/doc/Makefile
+++ b/doc/Makefile
@@ -25,7 +25,7 @@ FILES=
 # Internal variables.
 PAPEROPT_a4     = -D latex_paper_size=a4
 PAPEROPT_letter = -D latex_paper_size=letter
-ALLSPHINXOPTS   = -WT --keep-going -d build/doctrees $(PAPEROPT_$(PAPER)) \
+ALLSPHINXOPTS   = -T --keep-going -d build/doctrees $(PAPEROPT_$(PAPER)) \
                   $(SPHINXOPTS) source
 
 .PHONY: help clean html web htmlhelp latex changes linkcheck \