diff --git a/code/modules/mob/living/carbon/monkey/life.dm b/code/modules/mob/living/carbon/monkey/life.dm
index 77f5a2591e..ca6f5db5ca 100644
--- a/code/modules/mob/living/carbon/monkey/life.dm
+++ b/code/modules/mob/living/carbon/monkey/life.dm
@@ -30,7 +30,7 @@
 
 /mob/living/carbon/monkey/handle_mutations_and_radiation()
 	if(radiation)
-		if(prob(max(0, radiation - RAD_MOB_MUTATE) / 100))
+		if(prob(max(0, radiation - RAD_MOB_MUTATE) / 25))
 			gorillize()
 			return
 		if(radiation > RAD_MOB_KNOCKDOWN && prob(RAD_MOB_KNOCKDOWN_PROB))