diff --git a/src/callbacks_step/glm_speed.jl b/src/callbacks_step/glm_speed.jl
index 3d5133cffe7..b7f0323ba02 100644
--- a/src/callbacks_step/glm_speed.jl
+++ b/src/callbacks_step/glm_speed.jl
@@ -44,7 +44,7 @@ function Base.show(io::IO, ::MIME"text/plain",
         setup = [
             "GLM wave speed scaling" => glm_speed_callback.glm_scale,
             "Expected CFL number" => glm_speed_callback.cfl,
-	    "Coupled semis indices" => glm_speed_callback.semi_indices,
+            "Coupled semis indices" => glm_speed_callback.semi_indices,
         ]
         summary_box(io, "GlmSpeedCallback", setup)
     end