diff --git a/source/trunk/src/EvolutionData.cxx b/source/trunk/src/EvolutionData.cxx
index 5bf46ca86ad5fc0bc92166cc84fbe0e770cabd45..4e1a82878f34bc84771803388972d9e58a717588 100755
--- a/source/trunk/src/EvolutionData.cxx
+++ b/source/trunk/src/EvolutionData.cxx
@@ -45,7 +45,7 @@ double 	Distance(IsotopicVector IV1, EvolutionData Evd1 )
 	double d2=0;
 	IsotopicVector IV2 = Evd1.GetIsotopicVectorAt(0.);
 
-	IsotopicVector IVtmp = IV1 + IV2;
+	IsotopicVector IVtmp = IV1;
 	map<ZAI ,double> IVtmpIsotopicQuantity = IVtmp.GetIsotopicQuantity();
 	map<ZAI ,double >::iterator it;