diff --git a/code/datums/diseases/advance/symptoms/fever.dm b/code/datums/diseases/advance/symptoms/fever.dm
index 15aadb73294..b018e8f34e3 100644
--- a/code/datums/diseases/advance/symptoms/fever.dm
+++ b/code/datums/diseases/advance/symptoms/fever.dm
@@ -36,6 +36,6 @@ Bonus
 	return
 
 /datum/symptom/fever/proc/Heat(mob/living/M, datum/disease/advance/A)
-	var/get_heat = (sqrt(21+A.totalTransmittable()*2))+(sqrt(20+A.totalStageSpeed()*3))
+	var/get_heat = (sqrt(max(21,21+A.totalTransmittable()*2)))+(sqrt(max(21,20+A.totalStageSpeed()*3)))
 	M.bodytemperature = min(M.bodytemperature + (get_heat * A.stage), BODYTEMP_HEAT_DAMAGE_LIMIT - 1)
-	return 1
\ No newline at end of file
+	return 1