diff --git a/src/refinement/refinement.jl b/src/refinement/refinement.jl
index c2086b711..8512a9d5f 100644
--- a/src/refinement/refinement.jl
+++ b/src/refinement/refinement.jl
@@ -8,6 +8,7 @@ struct ParticleRefinement{SP, RC, ELTYPE}
     refinement_criteria       :: RC
     max_spacing_ratio         :: ELTYPE
     mass_ref                  :: Vector{ELTYPE} # length(mass_ref) == nparticles
+    delete_candidates         :: Vector{Bool} # length(delete_candidates) == nparticles
     n_particles_before_resize :: Ref{Int}
     n_new_particles           :: Ref{Int}
 end
@@ -22,7 +23,7 @@ function ParticleRefinement(; refinement_pattern, max_spacing_ratio,
     end
 
     return ParticleRefinement(refinement_pattern, refinement_criteria, max_spacing_ratio,
-                              mass_ref, Ref(0), Ref(0))
+                              mass_ref, delete_candidates, Ref(0), Ref(0))
 end
 
 resize_refinement!(system) = system