diff --git a/conf.py b/conf.py
index cc170df7..bf1801c6 100644
--- a/conf.py
+++ b/conf.py
@@ -31,6 +31,7 @@
     r'https://twiki.cern.ch/.*',  # most pages now require a login
     r'https://opensource.org.*',  # 403 error - rejects the bot
     r'https://xrootd.slac.stanford.edu/doc/.*',  # redirect error - rejects the bot with SSL failure
+    r'https://sourceforge.net/.*', # 403 error - rejects the bot
 ]
 
 starterkit_ci_redirects['first-analysis-steps/index.html'] = 'https://lhcb.github.io/starterkit-lessons/first-analysis-steps/README.html'