diff --git a/tox.ini b/tox.ini
index 72cd226..28fc144 100644
--- a/tox.ini
+++ b/tox.ini
@@ -62,8 +62,8 @@ commands =
 deps =
     -r{toxinidir}/docs/requirements.txt
 commands =
-    sphinx-build {posargs:-E} -T -b readthedocs -c docs/source . dist/docs
-    sphinx-build {posargs:-E} -T -b linkcheck   -c docs/source . dist/docs
+    sphinx-build {posargs:-E} -T -b readthedocs docs/source dist/docs
+    sphinx-build {posargs:-E} -T -b linkcheck   docs/source dist/docs
 
 [testenv:spell]
 skip_install = true