diff --git a/tox.ini b/tox.ini
index 0169635..8755020 100644
--- a/tox.ini
+++ b/tox.ini
@@ -47,7 +47,7 @@ deps =
 commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:pdf-docs]
-deps = -r{toxinidir}/doc/requirements.txt
+deps = {[testenv:docs]deps}
 whitelist_externals =
   make
 commands =