diff --git a/src/thermophysicalModels/specie/specie/specie.H b/src/thermophysicalModels/specie/specie/specie.H
index 354fdcce..958b24eb 100644
--- a/src/thermophysicalModels/specie/specie/specie.H
+++ b/src/thermophysicalModels/specie/specie/specie.H
@@ -65,6 +65,9 @@ class specie
         //- Molecular weight of specie [kg/kmol]
         scalar molWeight_;
 
+        //- Number of elementary charges of specie
+        scalar nCharges_;
+
 
 public: