diff --git a/src/adv/AdvPlayer.lua b/src/adv/AdvPlayer.lua
index 5193b9d..d08204c 100644
--- a/src/adv/AdvPlayer.lua
+++ b/src/adv/AdvPlayer.lua
@@ -795,7 +795,7 @@ function Player:changeSp(value, cType)
 	if cType == 0 then
 		change = value
 	elseif cType == 1 then
-		change = self.sp * value / 100
+		change = self.spMax * value / 100
 	end
 	local old = self.sp
 	self.sp = math.floor(math.min(self.spMax, math.max(0, self.sp + change)))
--
libgit2 0.21.2