diff --git a/Solver/linearSystem.h b/Solver/linearSystem.h
index 34fbc579302aab28e7528eb4d0dd4b51ac55e933..40ac6dbacbeb1ec15bc07889b04032448681ee3f 100644
--- a/Solver/linearSystem.h
+++ b/Solver/linearSystem.h
@@ -26,6 +26,7 @@ class linearSystemBase {
   void setParameter (std::string key, std::string value);
   virtual void insertInSparsityPattern(int _row, int _col){};
   virtual double normInfRightHandSide() const = 0;
+  virtual double normInfSolution() const {return 0;};
   virtual void createMatrix() {};
 };