diff --git a/SimoxUtility/math/regression/linear.hpp b/SimoxUtility/math/regression/linear.hpp
index a082d17c543f1a441b7bd15aa092e3e43b8bb442..3b878cbf98565c5b98e48696f65152695ed8f2da 100644
--- a/SimoxUtility/math/regression/linear.hpp
+++ b/SimoxUtility/math/regression/linear.hpp
@@ -48,7 +48,7 @@ namespace simox::math
     {
     public:
 
-        static const int Dim = _Dim;
+        static constexpr int Dim = _Dim;
         using FloatT = _FloatT;
         using VectorT = typename Eigen::Matrix<FloatT, Dim, 1>;
         using CoefficientsMatrixT = typename Eigen::Matrix<FloatT, Dim, 2>;