diff --git a/tox.ini b/tox.ini
index b36676160..56b0a523d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -71,7 +71,7 @@ deps =
 
 commands =
     python -m pip install .
-    sphinx-build {posargs:-E} -W -b html docs/src docs/build/html
+    sphinx-build {posargs:-E} -b html docs/src docs/build/html
 
 [flake8]
 # longer lines for compatibility with other linters