diff --git a/docs/Makefile b/docs/Makefile
index 51285967a7d9722c5bdee4f6a81c154a56aa0846..b235f7e2f9111548b621c0ffa9c4102f27966206 100644
--- a/docs/Makefile
+++ b/docs/Makefile
@@ -2,7 +2,7 @@
 #
 
 # You can set these variables from the command line.
-SPHINXOPTS    =
+SPHINXOPTS    = -W --keep-going
 SPHINXBUILD   = sphinx-build
 SOURCEDIR     = .
 BUILDDIR      = _build