diff --git a/examples/tree_2d_dgsem/elixir_euler_vortex_amr.jl b/examples/tree_2d_dgsem/elixir_euler_vortex_amr.jl
index e9831c95526..fd25defd417 100644
--- a/examples/tree_2d_dgsem/elixir_euler_vortex_amr.jl
+++ b/examples/tree_2d_dgsem/elixir_euler_vortex_amr.jl
@@ -27,7 +27,6 @@ function (indicator_vortex::IndicatorVortex)(u::AbstractArray{<:Any, 4},
                                              t, kwargs...)
     mesh = indicator_vortex.cache.mesh
     alpha = indicator_vortex.cache.alpha
-    indicator_threaded = indicator_vortex.cache.indicator_threaded
     resize!(alpha, nelements(dg, cache))
 
     # get analytical vortex center (based on assumption that center=[0.0,0.0]
@@ -57,6 +56,11 @@ function periodic_distance_2d(coordinates, center, domain_length)
     return sqrt(sum(abs2, dx_periodic))
 end
 
+# Optional: Nicer display of the indicator
+function Base.show(io::IO, ::MIME"text/plain", indicator::IndicatorVortex)
+    Trixi.summary_box(io, "IndicatorVortex")
+end
+
 end # module TrixiExtension
 
 import .TrixiExtension