diff --git a/code/__SANDCODE/HELPERS/math.dm b/code/__SANDCODE/HELPERS/math.dm
index 6291cef598..05eca8146c 100644
--- a/code/__SANDCODE/HELPERS/math.dm
+++ b/code/__SANDCODE/HELPERS/math.dm
@@ -1,4 +1,4 @@
 /proc/percentage_between(x,a,b,centesimal = TRUE)
 	if (a > b)
-		return percentage_between(x,b,a)
+		return percentage_between(x, b, a, centesimal)
 	return clamp((x-a)/(b-a),0,1) * (centesimal ? 100 : 1)