diff --git a/src/callbacks/callbacks.jl b/src/callbacks/callbacks.jl
index b0d6e8dedf..5b3fa220f0 100644
--- a/src/callbacks/callbacks.jl
+++ b/src/callbacks/callbacks.jl
@@ -254,7 +254,7 @@ NVTX.@annotate function rrtmgp_model_callback!(integrator)
                         p.tracers.prescribed_aerosols_field,
                         prescribed_aerosol_name,
                     )
-                    @. ᶜaero_conc = aerosol_field * Y.c.ρ * ᶜΔz * 4
+                    @. ᶜaero_conc = aerosol_field * Y.c.ρ * ᶜΔz
                 else
                     @. ᶜaero_conc = 0
                 end