diff --git a/lhcbnightlyconf/Main.py b/lhcbnightlyconf/Main.py
index 29c48248e0b4b4c085813687ff85d5b972cd5409..bf95dec554c09f4452d4e844d7f1edbe959e1590 100644
--- a/lhcbnightlyconf/Main.py
+++ b/lhcbnightlyconf/Main.py
@@ -92,7 +92,7 @@ def create_head_slot(name,
 slots = []
 
 gaudi_head = create_head_slot('lhcb-gaudi-head')
-gaudi_head.cache_entries["GAUDI_TEST_PUBLIC_HEADERS_BUILD"] = True
+gaudi_head.cache_entries["GAUDI_V21"] = True
 slots.append(gaudi_head)
 
 head = create_head_slot('lhcb-head')