diff --git a/docs/conf.py b/docs/conf.py
index 4aaa9091bc..d2f460f595 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -41,7 +41,7 @@ def real_dir_name(p, n=1):
 # -- General configuration ------------------------------------------------
 
 # If your documentation needs a minimal Sphinx version, state it here.
-#needs_sphinx = '1.0'
+needs_sphinx = '1.5.6'
 
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom