diff --git a/NumLib/NewtonRaphson.h b/NumLib/NewtonRaphson.h
index b78af5dfafb53184e66a6e1d72aa61c228c43425..22820b858d118a65cd3679d0c5117fd4f830b7d6 100644
--- a/NumLib/NewtonRaphson.h
+++ b/NumLib/NewtonRaphson.h
@@ -20,9 +20,9 @@ namespace NumLib
 
 struct NewtonRaphsonSolverParameters
 {
-    int const maximum_iterations;
-    double const residuum_tolerance;
-    double const increment_tolerance;
+    int maximum_iterations;
+    double residuum_tolerance;
+    double increment_tolerance;
 };
 
 /// Newton-Raphson solver for system of equations using an Eigen linear solvers