diff --git a/src/adv/AdvPlayer.lua b/src/adv/AdvPlayer.lua
index 0695282..39f7756 100644
--- a/src/adv/AdvPlayer.lua
+++ b/src/adv/AdvPlayer.lua
@@ -610,14 +610,15 @@ end
 function Player:changeSp(value, cType)
 	local oldSp = self.sp
 	cType = cType or 0
+	local change = 0
 	if cType == 0 then
-		self.sp = self.sp + value
+		change = value
 	elseif cType == 1 then
-		self.sp = self.sp + self.sp * value / 100
+		change = self.sp * value / 100
 	end
-	self.sp = math.floor(math.min(self.spMax, math.max(0, self.sp)))
-	if self.sp - oldSp ~= 0 then
-		self.battle.adv:pushBackEvent(AdvBackEventType.SpChange, {change = self.sp - oldSp})
+	self.sp = math.floor(math.min(self.spMax, math.max(0, self.sp + change)))
+	if change ~= 0 then
+		self.battle.adv:pushBackEvent(AdvBackEventType.SpChange, {change = math.floor(change)})
 	end
 end
 
--
libgit2 0.21.2