diff --git a/code/modules/surgery/organs/organ_internal.dm b/code/modules/surgery/organs/organ_internal.dm
index 194a10f4c4..8c45824402 100644
--- a/code/modules/surgery/organs/organ_internal.dm
+++ b/code/modules/surgery/organs/organ_internal.dm
@@ -28,6 +28,7 @@
 	var/now_fixed
 	var/high_threshold_cleared
 	var/low_threshold_cleared
+	rad_flags = RAD_NO_CONTAMINATE
 
 /obj/item/organ/proc/Insert(mob/living/carbon/M, special = 0, drop_if_replaced = TRUE)
 	if(!iscarbon(M) || owner == M)