diff --git a/code/modules/unit_tests/projectiles.dm b/code/modules/unit_tests/projectiles.dm
index 00350a853a1..a55ff7ee674 100644
--- a/code/modules/unit_tests/projectiles.dm
+++ b/code/modules/unit_tests/projectiles.dm
@@ -9,6 +9,7 @@
 	var/obj/item/gun/test_gun = allocate(/obj/item/gun/ballistic/automatic/pistol)
 	var/mob/living/carbon/human/victim = allocate(/mob/living/carbon/human)
 	var/mob/living/carbon/human/gunner = allocate(/mob/living/carbon/human)
+	ADD_TRAIT(victim, TRAIT_PIERCEIMMUNE, INNATE_TRAIT) // So the human isn't randomly affected by shrapnel
 
 	var/obj/item/ammo_casing/loaded_casing = test_gun.chambered
 	TEST_ASSERT(loaded_casing, "Gun started without round chambered, should be loaded")