diff --git a/testApp/chemFoam.C b/testApp/chemFoam.C
index d54059f..048bf9b 100644
--- a/testApp/chemFoam.C
+++ b/testApp/chemFoam.C
@@ -247,7 +247,8 @@ int main(int argc, char *argv[])
 
         forAll(thermo.composition().species(), k)
         {
-            scalarField YY(0.0);
+            scalarField YY(XY);
+            YY = 0.0;
             YY[k] = 1.0;
             gas_.setState_TPY(thermo.T()[0], p[0], YY.data());