diff --git a/examples/demo-fh.jl b/examples/demo-fh.jl
index ffef31f7..702846a6 100644
--- a/examples/demo-fh.jl
+++ b/examples/demo-fh.jl
@@ -1,3 +1,4 @@
+using LinearAlgebra
 using DifferentialEquations, ProximalOperators
 using ADNLPModels, NLPModels, NLPModelsModifiers, RegularizedOptimization, RegularizedProblems
 
diff --git a/examples/demo-nnmf-constr.jl b/examples/demo-nnmf-constr.jl
index 1300608a..e6fc8f64 100644
--- a/examples/demo-nnmf-constr.jl
+++ b/examples/demo-nnmf-constr.jl
@@ -28,11 +28,6 @@ function demo_solver(f, h, χ, selected, Avec, m, n, k, suffix = "l0-linf")
   R2_out = R2(f, h, options, selected = selected)
   plot_nnmf(R2_out, Avec, m, n, k, "r2-$suffix")
 
-  @info " using TR with R2 as subproblem to solve with" h χ
-  reset!(f)
-  TR_out = TR(f, h, χ, options, selected = selected)
-  plot_nnmf(TR_out, Avec, m, n, k, "tr-r2-$suffix")
-
   subsolver_options = ROSolverOptions(spectral = false, psb = true, ϵa = options.ϵa)
   @info " using TR with TRDH as subproblem to solve with" h χ
   reset!(f)