diff --git a/code/modules/mob/living/carbon/monkey/life.dm b/code/modules/mob/living/carbon/monkey/life.dm
index 9a6a44bd577..5ea416371e1 100644
--- a/code/modules/mob/living/carbon/monkey/life.dm
+++ b/code/modules/mob/living/carbon/monkey/life.dm
@@ -29,7 +29,7 @@
 				emote("collapse")
 			Knockdown(200)
 			to_chat(src, "<span class='danger'>You feel weak.</span>")
-		if(radiation > 30 && prob((radiation - 30) * (radiation - 30) * 0.002))
+		if(radiation > 30 && prob((radiation - 30) * (radiation - 30) * 0.00002))
 			gorillize()
 			return
 		switch(radiation)