1 files changed, 2 insertions, 2 deletions
diff --git a/tox.ini b/tox.ini
index f3b21561f..d3e494de9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -57,13 +57,13 @@ setenv =
 whitelist_externals = make
 commands =
     pip install pyramid[docs]
-    make -C docs html epub BUILDDIR={envdir}
+    make -C docs html epub BUILDDIR={envdir} "SPHINXOPTS=-W -E"
 
 [testenv:py3-docs]
 whitelist_externals = make
 commands =
     pip install pyramid[docs]
-    make -C docs html epub BUILDDIR={envdir}
+    make -C docs html epub BUILDDIR={envdir} "SPHINXOPTS=-W -E"
 
 [testenv:py26-scaffolds]
 basepython = python2.6