diff --git a/doc/sphinx-guides/Makefile b/doc/sphinx-guides/Makefile
index fd0a8f260fb..b11416165a7 100755
--- a/doc/sphinx-guides/Makefile
+++ b/doc/sphinx-guides/Makefile
@@ -2,7 +2,7 @@
 #
 
 # You can set these variables from the command line.
-SPHINXOPTS    =
+SPHINXOPTS    = -W
 SPHINXBUILD   = sphinx-build
 PAPER         =
 BUILDDIR      = build