diff --git a/code/datums/weather/weather_types/radiation_storm.dm b/code/datums/weather/weather_types/radiation_storm.dm
index a8cb8f4307..0d763aa5ad 100644
--- a/code/datums/weather/weather_types/radiation_storm.dm
+++ b/code/datums/weather/weather_types/radiation_storm.dm
@@ -32,7 +32,7 @@
 /datum/weather/rad_storm/weather_act(mob/living/L)
 	var/resist = L.getarmor(null, "rad")
 	var/ratio = 1 - (min(resist, 100) / 100)
-	L.rad_act(radiation_intensity * percent)
+	L.rad_act(radiation_intensity * ratio)
 
 /datum/weather/rad_storm/end()
 	if(..())