diff --git a/src/adv/AdvPlayer.lua b/src/adv/AdvPlayer.lua
index e5b25b0..052d68d 100644
--- a/src/adv/AdvPlayer.lua
+++ b/src/adv/AdvPlayer.lua
@@ -631,7 +631,9 @@ function Player:changeSp(value, cType)
 	elseif cType == 1 then
 		change = self.sp * value / 100
 	end
+	local old = self.sp
 	self.sp = math.floor(math.min(self.spMax, math.max(0, self.sp + change)))
+	change = self.sp - old
 	if change ~= 0 then
 		self.battle.adv:pushBackEvent(AdvBackEventType.SpChange, {change = math.floor(change)})
 	end
--
libgit2 0.21.2