diff --git a/include/solid_mechanics/mf_elasticity.h b/include/solid_mechanics/mf_elasticity.h
index 2e3c91e..dbde744 100644
--- a/include/solid_mechanics/mf_elasticity.h
+++ b/include/solid_mechanics/mf_elasticity.h
@@ -1922,6 +1922,7 @@ namespace FSI
 
     constraints.clear();
     constraints.reinit(locally_relevant_dofs);
+    DoFTools::make_hanging_node_constraints(dof_handler, constraints);
 
     mg_constrained_dofs.clear();
     mg_constrained_dofs.initialize(dof_handler);