diff --git a/lhcbnightlyconf/Gauss.py b/lhcbnightlyconf/Gauss.py
index 7e479bdef244e52a3ed1e1a7f121e84ce10bbd77..806ea0c5274390f68d721d6ef9dcb5004ad1113d 100644
--- a/lhcbnightlyconf/Gauss.py
+++ b/lhcbnightlyconf/Gauss.py
@@ -226,7 +226,7 @@ gaussSim10Gaudi.LCG.version = '105c'
 gaussSim10Gaudi.Geant4.disabled = False
 gaussSim10Gaudi.Geant4.version = 'sim10-patches'
 gaussSim10Gaudi.Geant4.checkout_opts["merges"] = ["all"]
-gaussSim10Gaudi.Gaudi.version = 'HEAD'
+gaussSim10Gaudi.Gaudi.version = 'v39r3'
 gaussSim10Gaudi.Gaudi.disabled = False
 #gaussSim10Gaudi.Gaudi.checkout_opts["merges"] = ["label=lhcb-gaudi-head"]
 slots.append(gaussSim10Gaudi)