diff --git a/doc/conf.py b/doc/conf.py
index 043d477612..128002b1ed 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -19,6 +19,14 @@
 import nipype
 import subprocess as sp
 
+html_baseurl = os.environ.get("READTHEDOCS_CANONICAL_URL", "")
+
+# Tell Jinja2 templates the build is running on Read the Docs
+if os.environ.get("READTHEDOCS", "") == "True":
+    if "html_context" not in globals():
+        html_context = {}
+    html_context["READTHEDOCS"] = True
+
 # Disable etelemetry during doc builds
 os.environ["NIPYPE_NO_ET"] = "1"
 
@@ -132,10 +140,6 @@
 ]
 
 
-on_rtd = os.environ.get("READTHEDOCS") == "True"
-if on_rtd:
-    extensions.append("readthedocs_ext.readthedocs")
-
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ["_templates"]