diff --git a/docs/conf.py b/docs/conf.py
index e6b3cd6..18ae49c 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -33,7 +33,8 @@
 copyright = '2023-2024, Space Telescope Science Institute'
 author = 'Joseph Hunkeler'
 
-html_extra_path = ["html"]
+htmldir = os.path.join(os.environ.get("READTHEDOCS_OUTPUT", ""), "html")
+html_extra_path = [htmldir]
 
 # -- General configuration ---------------------------------------------------