diff --git a/ProcessLib/Deformation/BMatrixPolicy.h b/ProcessLib/Deformation/BMatrixPolicy.h
index ea44397bea0c36380629f2eef2cd9b0e6ea11426..b7fec08b574f2ec8bdd4d289fdb7df456e4b8313 100644
--- a/ProcessLib/Deformation/BMatrixPolicy.h
+++ b/ProcessLib/Deformation/BMatrixPolicy.h
@@ -53,5 +53,7 @@ public:
         MatrixType<_kelvin_vector_size, _kelvin_vector_size>;
 
     using BMatrixType = MatrixType<_kelvin_vector_size, _number_of_dof>;
+
+    using BBarMatrixType = MatrixType<3, ShapeFunction::NPOINTS>;
 };
 }  // namespace ProcessLib