diff --git a/DaVinciTests/tests/options/DVTestWriteDst.py b/DaVinciTests/tests/options/DVTestWriteDst.py
index ad7a99f3da92af2ac8ac4a235d504894832a3cf4..eb66d5cdb9053c430b4e2e261ad79a2d9cb1e165 100755
--- a/DaVinciTests/tests/options/DVTestWriteDst.py
+++ b/DaVinciTests/tests/options/DVTestWriteDst.py
@@ -52,6 +52,7 @@ for i in MassRanges :
 
     # define the prescale to have a constant (assumed flat) level of background
     prescale = DeterministicPrescaler("Prescale_"+name,
+                                      SeedName="Prescale_"+name,
                                       AcceptFraction = 100./(hm-lm))
     filter   = FilterDesktop("Jpsi_"+name,
                              Code = "(MM>"+ln+") & (MM<"+hn+") & (MIPCHI2DV(PRIMARY) > 2)")