diff --git a/src/ComputationalModels/ComputationalModels.jl b/src/ComputationalModels/ComputationalModels.jl
index 7453957..3f850de 100644
--- a/src/ComputationalModels/ComputationalModels.jl
+++ b/src/ComputationalModels/ComputationalModels.jl
@@ -1,7 +1,6 @@
 module ComputationalModels
 using HyperFEM.PhysicalModels
 using HyperFEM.Solvers
-using HyperFEM.EvolutionFunctions
 
 using Gridap
 using Gridap.Helpers
diff --git a/src/ComputationalModels/Drivers.jl b/src/ComputationalModels/Drivers.jl
index f4334a5..cdff982 100644
--- a/src/ComputationalModels/Drivers.jl
+++ b/src/ComputationalModels/Drivers.jl
@@ -43,7 +43,7 @@ end
 function solve!(m::StaggeredModel;
     stepping=(nsteps=20, nsubsteps=1, maxbisec=15),
     presolver=(τ, ∆τ) -> nothing,
-    evolτ=ramp(1.0),
+    evolτ=t-> max(min(t, 1.0), 0.0),
     kargsolve)
 
     nsubsteps = stepping[:nsubsteps]