diff --git a/code/modules/mob/living/carbon/monkey/life.dm b/code/modules/mob/living/carbon/monkey/life.dm
index ca6f5db5ca..a90c2c33f3 100644
--- a/code/modules/mob/living/carbon/monkey/life.dm
+++ b/code/modules/mob/living/carbon/monkey/life.dm
@@ -30,8 +30,9 @@
 
 /mob/living/carbon/monkey/handle_mutations_and_radiation()
 	if(radiation)
-		if(prob(max(0, radiation - RAD_MOB_MUTATE) / 25))
-			gorillize()
+		var/ooga_chance = (radiation - RAD_MOB_MUTATE) / 25
+		if(ooga_chance > 0 && prob(ooga_chance))
+			gorillize() 
 			return
 		if(radiation > RAD_MOB_KNOCKDOWN && prob(RAD_MOB_KNOCKDOWN_PROB))
 			if(!IsKnockdown())