diff --git a/code/datums/dna.dm b/code/datums/dna.dm
index f569305211..affff88b9d 100644
--- a/code/datums/dna.dm
+++ b/code/datums/dna.dm
@@ -395,7 +395,7 @@
 	return dna
 
 
-/mob/living/carbon/human/proc/hardset_dna(ui, list/mutation_index, newreal_name, newblood_type, datum/species/mrace, newfeatures)
+/mob/living/carbon/human/proc/hardset_dna(ui, list/mutation_index, list/default_mutation_genes, newreal_name, newblood_type, datum/species/mrace, newfeatures)
 
 	if(newreal_name)
 		real_name = newreal_name