diff --git a/dune/elasticity/materials/exphenckydensity.hh b/dune/elasticity/materials/exphenckydensity.hh
index 9258e57a9a507283f51809fa0d0db67ba904d7eb..3f2a299c9f866144d4ad6c2ba3d0ad831e110765 100644
--- a/dune/elasticity/materials/exphenckydensity.hh
+++ b/dune/elasticity/materials/exphenckydensity.hh
@@ -85,7 +85,7 @@ public:
   }
 
   /** \brief Lame constants */
-  field_type mu_, lambda_, kappa_, k_, khat_, alpha_, beta_;
+  double mu_, lambda_, kappa_, k_, khat_, alpha_, beta_;
 };
 
 } // namespace Dune::Elasticity
diff --git a/dune/elasticity/materials/mooneyrivlindensity.hh b/dune/elasticity/materials/mooneyrivlindensity.hh
index d1dd3b15b82241b9c75a614efffdb7a7a9c482e0..5f1d38610d1f7bd70ce7e453a2e735590092fa06 100644
--- a/dune/elasticity/materials/mooneyrivlindensity.hh
+++ b/dune/elasticity/materials/mooneyrivlindensity.hh
@@ -137,19 +137,19 @@ public:
   }
 
   /** \brief Lame constants */
-  field_type mooneyrivlin_a,
-             mooneyrivlin_b,
-             mooneyrivlin_c,
-             mooneyrivlin_10,
-             mooneyrivlin_01,
-             mooneyrivlin_20,
-             mooneyrivlin_02,
-             mooneyrivlin_11,
-             mooneyrivlin_30,
-             mooneyrivlin_21,
-             mooneyrivlin_12,
-             mooneyrivlin_03,
-             mooneyrivlin_k;
+  double mooneyrivlin_a,
+         mooneyrivlin_b,
+         mooneyrivlin_c,
+         mooneyrivlin_10,
+         mooneyrivlin_01,
+         mooneyrivlin_20,
+         mooneyrivlin_02,
+         mooneyrivlin_11,
+         mooneyrivlin_30,
+         mooneyrivlin_21,
+         mooneyrivlin_12,
+         mooneyrivlin_03,
+         mooneyrivlin_k;
   std::string mooneyrivlin_energy;
 };
 
diff --git a/dune/elasticity/materials/neohookedensity.hh b/dune/elasticity/materials/neohookedensity.hh
index f93acf04c5b0672a4af73b6dd5e8016e875a9017..9b3f2f3b5786b54bb0bb6e3c3b5a93bacbdd0a02 100644
--- a/dune/elasticity/materials/neohookedensity.hh
+++ b/dune/elasticity/materials/neohookedensity.hh
@@ -76,7 +76,7 @@ public:
   }
 
   /** \brief Lame constants */
-  field_type mu_, lambda_, kappa_;
+  double mu_, lambda_, kappa_;
 };
 
 } // namespace Dune::Elasticity