diff --git a/doc/source/conf.py b/doc/source/conf.py
index 5e2fb04..138d34e 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -210,7 +210,10 @@
 
 # -- Options for linkcheck output ---------------------------------------------
 linkcheck_retry = 5
-linkcheck_ignore = ['https://hsthelp.stsci.edu', 'https://acszeropoints.stsci.edu']
+linkcheck_ignore = [
+    'https://hsthelp.stsci.edu',
+    'https://acszeropoints.stsci.edu',
+    'https://acspsf.stsci.edu']
 linkcheck_timeout = 180
 linkcheck_anchors = False