diff --git a/server-ca/CONFIG.py b/server-ca/CONFIG.py
index c28e97626..75017aa93 100644
--- a/server-ca/CONFIG.py
+++ b/server-ca/CONFIG.py
@@ -26,3 +26,6 @@ hashcash_expiry = 60*60
 # Extra names that the CA refuses to issue for, apart from those in
 # the blacklist table in the database.
 extra_name_blacklist = ["eff.org", "www.eff.org"]
+
+# Name of file containing cert chain
+cert_chain_file = "chain.pem"