diff --git a/code/modules/projectiles/gun_attachables.dm b/code/modules/projectiles/gun_attachables.dm
index f875af99bb43..960bbd3a1647 100644
--- a/code/modules/projectiles/gun_attachables.dm
+++ b/code/modules/projectiles/gun_attachables.dm
@@ -2797,7 +2797,7 @@ Defined in conflicts.dm of the #defines folder.
 	if(!breech_open)
 		to_chat(user, SPAN_WARNING("\The [src]'s breech must be open to load grenades! (use unique-action)"))
 		return
-	if(!istype(G) || istype(G, /obj/item/explosive/grenade/spawnergrenade/))
+	if(!istype(G) || istype(G, /obj/item/explosive/grenade/spawnergrenade/) || istype(G, /obj/item/explosive/grenade/custom))
 		to_chat(user, SPAN_WARNING("[src] doesn't accept that type of grenade."))
 		return
 	if(!G.active) //can't load live grenades
diff --git a/code/modules/projectiles/guns/specialist/launcher/grenade_launcher.dm b/code/modules/projectiles/guns/specialist/launcher/grenade_launcher.dm
index 0f767d679d03..795cc18bed5f 100644
--- a/code/modules/projectiles/guns/specialist/launcher/grenade_launcher.dm
+++ b/code/modules/projectiles/guns/specialist/launcher/grenade_launcher.dm
@@ -25,7 +25,7 @@
 	///Does it launch its grenades in a low arc or a high? Do they strike people in their path, or fly beyond?
 	var/is_lobbing = FALSE
 	///Verboten munitions. This is a blacklist. Anything in this list isn't loadable.
-	var/disallowed_grenade_types = list(/obj/item/explosive/grenade/spawnergrenade, /obj/item/explosive/grenade/alien, /obj/item/explosive/grenade/incendiary/molotov, /obj/item/explosive/grenade/flashbang)
+	var/disallowed_grenade_types = list(/obj/item/explosive/grenade/spawnergrenade, /obj/item/explosive/grenade/alien, /obj/item/explosive/grenade/incendiary/molotov, /obj/item/explosive/grenade/flashbang, /obj/item/explosive/grenade/custom)
 	///What is this weapon permitted to fire? This is a whitelist. Anything in this list can be fired. Anything.
 	var/valid_munitions = list(/obj/item/explosive/grenade)
 
@@ -201,8 +201,6 @@
 	fired.forceMove(get_turf(src))
 	fired.throw_atom(target, 20, SPEED_VERY_FAST, user, null, NORMAL_LAUNCH, pass_flags)
 
-
-
 //Doesn't use these. Listed for reference.
 /obj/item/weapon/gun/launcher/grenade/load_into_chamber()
 	return