diff --git a/Alignment/OfflineValidation/python/TkAlAllInOneTool/Zmumu_cfg.py b/Alignment/OfflineValidation/python/TkAlAllInOneTool/Zmumu_cfg.py
index 387a07e817350..a92509c0b0e7d 100644
--- a/Alignment/OfflineValidation/python/TkAlAllInOneTool/Zmumu_cfg.py
+++ b/Alignment/OfflineValidation/python/TkAlAllInOneTool/Zmumu_cfg.py
@@ -144,7 +144,7 @@
 process.DiMuonMassValidation = _diMuonValidation.clone(
     TkTag = 'TrackRefitter',
     # mu mu mass
-    Pair_mass_min   = 80.,
+    Pair_mass_min   = 60.,
     Pair_mass_max   = 120.,
     Pair_mass_nbins = 80,
     Pair_etaminpos  = -2.4,