diff --git a/dune/tectonic/globalnonlinearity.hh b/dune/tectonic/globalnonlinearity.hh
index 3ba810a8f53eda196aeada7c8401093d1f16538c..f0ad8933926729abd5d55ed721958e87c1b4a90b 100644
--- a/dune/tectonic/globalnonlinearity.hh
+++ b/dune/tectonic/globalnonlinearity.hh
@@ -18,6 +18,7 @@ class GlobalNonlinearity {
   using SingletonVectorType = BlockVector<FieldVector<double, 1>>;
 
 public:
+  using IndexSet = Dune::MatrixIndexSet;
   using MatrixType = MatrixTypeTEMPLATE;
   using VectorType = VectorTypeTEMPLATE;
   using LocalMatrixType = typename MatrixType::block_type;