diff --git a/dumux/discretization/cellcentered/mpfa/properties.hh b/dumux/discretization/cellcentered/mpfa/properties.hh
index 3a20ad88449e6cfb1d6809240a930c123f73a2a1..ce805e818a37a5fa7f8c5395f284b6fd4d15a26f 100644
--- a/dumux/discretization/cellcentered/mpfa/properties.hh
+++ b/dumux/discretization/cellcentered/mpfa/properties.hh
@@ -81,7 +81,7 @@ private:
 
 public:
     // Per default, we allow for 8 neighbors on network/surface grids
-    static const std::size_t value = dim < dimWorld ? 9 : 2;
+    static constexpr std::size_t value = dim < dimWorld ? 9 : 2;
 };
 
 //! Set the index set type used on the dual grid nodes
diff --git a/dumux/discretization/cellcentered/tpfa/properties.hh b/dumux/discretization/cellcentered/tpfa/properties.hh
index 3710cf0fa7f339df01da81fc79ae8b570dac3f81..c9262c4b141561ec9b65bdec6de69c0019461f51 100644
--- a/dumux/discretization/cellcentered/tpfa/properties.hh
+++ b/dumux/discretization/cellcentered/tpfa/properties.hh
@@ -92,7 +92,7 @@ private:
 
 public:
     // Per default, we allow for 8 neighbors on network/surface grids
-    static const std::size_t value = dim < dimWorld ? 9 : 2;
+    static constexpr std::size_t value = dim < dimWorld ? 9 : 2;
 };
 
 //! The sub control volume