diff --git a/docs/source/conf.py b/docs/source/conf.py
index 47a94cc84..7ce2f6747 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -26,6 +26,7 @@
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
 
 html_theme = "furo"
+html_baseurl = "https://metoffice.github.io/CSET/"
 
 # -- LaTeX output configuration ----------------------------------------------
 # https://www.sphinx-doc.org/en/master/latex.html