diff --git a/buildout.cfg b/buildout.cfg
index d734adf5a4e7b7ee8f8c47231f28da9b0ad089d7..60e3fd3b11c89e6c6301df18a3185a3ba4984fa6 100644
--- a/buildout.cfg
+++ b/buildout.cfg
@@ -21,4 +21,4 @@ script = tests.py
 recipe = collective.recipe.sphinxbuilder
 source = ${buildout:directory}/docs
 build = ${buildout:directory}/built-docs
-interpreter = ${buildout:directory}/bin/python
+interpreter = ${buildout:bin-directory}/python
diff --git a/localbob.cfg b/localbob.cfg
index d85932d2d9d4305334a755897737bae8bed99288..34f1a56910af50ea1dd72464882aa9e7cc0427cd 100644
--- a/localbob.cfg
+++ b/localbob.cfg
@@ -30,4 +30,4 @@ script = tests.py
 recipe = collective.recipe.sphinxbuilder
 source = ${buildout:directory}/docs
 build = ${buildout:directory}/built-docs
-interpreter = ${buildout:directory}/bin/python
+interpreter = ${buildout:bin-directory}/python