diff --git a/examples/p4est_2d_dgsem/elixir_navierstokes_convergence.jl b/examples/p4est_2d_dgsem/elixir_navierstokes_convergence.jl
index 8111df8251a..b0c6086ad63 100644
--- a/examples/p4est_2d_dgsem/elixir_navierstokes_convergence.jl
+++ b/examples/p4est_2d_dgsem/elixir_navierstokes_convergence.jl
@@ -170,7 +170,10 @@ end
 initial_condition = initial_condition_navier_stokes_convergence_test
 
 # BC types
-velocity_bc_top_bottom = NoSlip((x, t, equations) -> initial_condition_navier_stokes_convergence_test(x, t, equations)[2:3])
+velocity_bc_top_bottom = NoSlip() do x, t, equations
+  u = initial_condition_navier_stokes_convergence_test(x, t, equations)
+  return SVector(u[2], u[3])
+end
 heat_bc_top_bottom = Adiabatic((x, t, equations) -> 0.0)
 boundary_condition_top_bottom = BoundaryConditionNavierStokesWall(velocity_bc_top_bottom, heat_bc_top_bottom)
 
diff --git a/examples/p4est_3d_dgsem/elixir_navierstokes_convergence.jl b/examples/p4est_3d_dgsem/elixir_navierstokes_convergence.jl
index c426fe95f5b..0109e58dfb3 100644
--- a/examples/p4est_3d_dgsem/elixir_navierstokes_convergence.jl
+++ b/examples/p4est_3d_dgsem/elixir_navierstokes_convergence.jl
@@ -220,7 +220,10 @@ end
 initial_condition = initial_condition_navier_stokes_convergence_test
 
 # BC types
-velocity_bc_top_bottom = NoSlip((x, t, equations) -> initial_condition_navier_stokes_convergence_test(x, t, equations)[2:4])
+velocity_bc_top_bottom = NoSlip() do x, t, equations
+  u = initial_condition_navier_stokes_convergence_test(x, t, equations)
+  return  SVector(u[2], u[3], u[4])
+end
 heat_bc_top_bottom = Adiabatic((x, t, equations) -> 0.0)
 boundary_condition_top_bottom = BoundaryConditionNavierStokesWall(velocity_bc_top_bottom, heat_bc_top_bottom)