diff --git a/dune/stuff/function/spe10.hh b/dune/stuff/function/spe10.hh
index 54b7a73c21265d55136c9c3f52459c731fdbd040..78218ee446ccc547ec6c41eee644dda951ea2aeb 100644
--- a/dune/stuff/function/spe10.hh
+++ b/dune/stuff/function/spe10.hh
@@ -72,11 +72,11 @@ public:
   }
 
 private:
-  static const size_t numXelements = 100;
-  static const size_t numYelements = 1;
-  static const size_t numZelements = 20;
-  static const double minValue     = 0.001;
-  static const double maxValue     = 998.915;
+  static const size_t numXelements       = 100;
+  static const size_t numYelements       = 1;
+  static const size_t numZelements       = 20;
+  static const constexpr double minValue = 0.001;
+  static const constexpr double maxValue = 998.915;
 
 public:
   FunctionSpe10Model1(const std::string filename, const DomainType& _lowerLeft, const DomainType& _upperRight,