diff --git a/ostap/fitting/efficiency.py b/ostap/fitting/efficiency.py
index b682091d..718a363e 100644
--- a/ostap/fitting/efficiency.py
+++ b/ostap/fitting/efficiency.py
@@ -248,7 +248,7 @@ def  fitTo ( self , dataset , silent = True , refit = 3 , args = () , **kwargs )
                                                   args   = vargs  , **kwargs )
             
             ## reset data token (problem appears at  6.33
-            if ( 6 , 28 ) <= root_info : 
+            if ( 6 , 30 ) <= root_info : 
                 for v in self.pdf_fit.variables :
                     if v.hasDataToken() :
                         self.pdf_fit.warning ( 'Reset data token for %s' % v.name )