diff --git a/code/datums/materials/_material.dm b/code/datums/materials/_material.dm
index 8d8605202f1..7a59ddcbf4c 100644
--- a/code/datums/materials/_material.dm
+++ b/code/datums/materials/_material.dm
@@ -95,7 +95,7 @@ Simple datum which is instanced once per type and is used for every object of sa
 	source.mat_update_desc(src)
 
 ///This proc is called when a material updates an object's description
-/atom/proc/mat_update_desc(/datum/material/mat)
+/atom/proc/mat_update_desc(datum/material/mat)
 	return
 
 ///This proc is called when the material is added to an object specifically.
diff --git a/code/datums/quirks/negative.dm b/code/datums/quirks/negative.dm
index 972e16dcd53..9552062283c 100644
--- a/code/datums/quirks/negative.dm
+++ b/code/datums/quirks/negative.dm
@@ -300,7 +300,7 @@
 	SEND_SIGNAL(quirk_holder, COMSIG_CLEAR_MOOD_EVENT, "nyctophobia")
 
 /// Called when the quirk holder moves. Updates the quirk holder's mood.
-/datum/quirk/nyctophobia/proc/on_holder_moved(/mob/living/source, atom/old_loc, dir, forced)
+/datum/quirk/nyctophobia/proc/on_holder_moved(mob/living/source, atom/old_loc, dir, forced)
 	SIGNAL_HANDLER
 
 	if(quirk_holder.stat == DEAD)
diff --git a/code/modules/food_and_drinks/kitchen_machinery/smartfridge.dm b/code/modules/food_and_drinks/kitchen_machinery/smartfridge.dm
index 135ea279e28..9be8cf21947 100644
--- a/code/modules/food_and_drinks/kitchen_machinery/smartfridge.dm
+++ b/code/modules/food_and_drinks/kitchen_machinery/smartfridge.dm
@@ -308,7 +308,7 @@
 	if(!powered())
 		toggle_drying(TRUE)
 
-/obj/machinery/smartfridge/drying_rack/load(/obj/item/dried_object) //For updating the filled overlay
+/obj/machinery/smartfridge/drying_rack/load(obj/item/dried_object) //For updating the filled overlay
 	. = ..()
 	update_appearance()
 
diff --git a/code/modules/projectiles/guns/ballistic.dm b/code/modules/projectiles/guns/ballistic.dm
index fed2f497c33..29426bf4969 100644
--- a/code/modules/projectiles/guns/ballistic.dm
+++ b/code/modules/projectiles/guns/ballistic.dm
@@ -593,7 +593,7 @@ GLOBAL_LIST_INIT(gun_saw_types, typecacheof(list(
 		update_appearance()
 		return TRUE
 
-/obj/item/gun/ballistic/proc/guncleaning(mob/user, /obj/item/A)
+/obj/item/gun/ballistic/proc/guncleaning(mob/user, obj/item/A)
 	if(misfire_probability == 0)
 		to_chat(user, span_notice("[src] seems to be already clean of fouling."))
 		return