diff --git a/Docs/sphinx_doc/conf.py b/Docs/sphinx_doc/conf.py
index e677e62d1..bc27bbfa8 100644
--- a/Docs/sphinx_doc/conf.py
+++ b/Docs/sphinx_doc/conf.py
@@ -134,7 +134,9 @@
 # html_theme_options = {}
 
 # Add any paths that contain custom themes here, relative to this directory.
-# html_theme_path = []
+# Add path to the RTD explicitly to robustify builds
+import sphinx_rtd_theme
+html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
 
 # The name for this set of Sphinx documents.
 # "<project> v<release> documentation" by default.