diff --git a/src/callbacks_step/stepsize.jl b/src/callbacks_step/stepsize.jl
index 0a95cb35ad3..8b5cb958318 100644
--- a/src/callbacks_step/stepsize.jl
+++ b/src/callbacks_step/stepsize.jl
@@ -33,7 +33,7 @@ function Base.show(io::IO, ::MIME"text/plain",
         stepsize_callback = cb.affect!
 
         setup = [
-            "CFL number" => stepsize_callback.cfl_number
+            "CFL number" => stepsize_callback.cfl_number,
         ]
         summary_box(io, "StepsizeCallback", setup)
     end