diff --git a/modular_chomp/code/modules/mob/living/carbon/human/species/station/protean/protean_species.dm b/modular_chomp/code/modules/mob/living/carbon/human/species/station/protean/protean_species.dm
index 2ef4644c82..89ceae790c 100644
--- a/modular_chomp/code/modules/mob/living/carbon/human/species/station/protean/protean_species.dm
+++ b/modular_chomp/code/modules/mob/living/carbon/human/species/station/protean/protean_species.dm
@@ -152,7 +152,7 @@
 	return S.get_icobase(H, get_deform)
 
 /datum/species/protean/get_valid_shapeshifter_forms(var/mob/living/carbon/human/H)
-	var/static/list/protean_shapeshifting_forms = GLOB.playable_species.Copy() -= SPECIES_PROMETHEAN
+	var/static/list/protean_shapeshifting_forms = GLOB.playable_species.Copy() - SPECIES_PROMETHEAN
 	return protean_shapeshifting_forms
 
 /datum/species/protean/get_tail(var/mob/living/carbon/human/H)
@@ -419,4 +419,4 @@ CHOMP Removal end*/
 	. = ..()
 	. += validstring
 	. += registring
-#undef METAL_PER_TICK
\ No newline at end of file
+#undef METAL_PER_TICK