diff --git a/tox.ini b/tox.ini
index 42755ebf01..e11c9094bb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -24,7 +24,7 @@ commands = openstack-doc-test --check-links {posargs}
 [testenv:checkniceness]
 commands =
   openstack-doc-test --check-niceness {posargs}
-  doc8 -e .rst -e .txt doc
+  doc8 doc
 
 [testenv:checksyntax]
 commands =
@@ -85,3 +85,10 @@ commands = doc-tools-check-languages doc-tools-check-languages.conf test {posarg
 sitepackages=True
 whitelist_externals = doc-tools-check-languages
 commands = doc-tools-check-languages doc-tools-check-languages.conf publish all
+
+[doc8]
+# Settings for doc8:
+# Ignore target directories
+ignore_path = doc/*/target
+# File extensions to use
+extensions = .rst,.txt