diff --git a/tox.ini b/tox.ini
index bc0da1cb..ddec0466 100644
--- a/tox.ini
+++ b/tox.ini
@@ -39,10 +39,6 @@ commands =
   {toxinidir}/tools/build-all-rst.sh
 
 [testenv:checklang]
-# Generatedocbook needs xml2po which cannot be installed
-# in the venv. Since it's installed in the system, let's
-# use sitepackages.
-sitepackages=True
 whitelist_externals =
   doc-tools-check-languages
   bash
@@ -53,18 +49,10 @@ commands =
 
 [testenv:buildlang]
 # Run as "tox -e buildlang -- $LANG"
-# Generatedocbook needs xml2po which cannot be installed
-# in the venv. Since it's installed in the system, let's
-# use sitepackages.
-sitepackages=True
 whitelist_externals = doc-tools-check-languages
 commands = doc-tools-check-languages doc-tools-check-languages.conf test {posargs}
 
 [testenv:publishlang]
-# Generatedocbook needs xml2po which cannot be installed
-# in the venv. Since it's installed in the system, let's
-# use sitepackages.
-sitepackages=True
 whitelist_externals = doc-tools-check-languages
 commands = doc-tools-check-languages doc-tools-check-languages.conf publish all