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-rw-r--r--lib/spack/docs/Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/spack/docs/Makefile b/lib/spack/docs/Makefile
index 1ce5c1910c..1a8c13e8fb 100644
--- a/lib/spack/docs/Makefile
+++ b/lib/spack/docs/Makefile
@@ -2,7 +2,7 @@
#
# You can set these variables from the command line.
-SPHINXOPTS = -E
+SPHINXOPTS = -W
SPHINXBUILD = sphinx-build
PAPER =
BUILDDIR = _build