diff --git a/src/ec/quanta/it8518/acpi/battery.asl b/src/ec/quanta/it8518/acpi/battery.asl
index 92947332de..001502106e 100644
--- a/src/ec/quanta/it8518/acpi/battery.asl
+++ b/src/ec/quanta/it8518/acpi/battery.asl
@@ -317,7 +317,7 @@ Device (BATX)
 
 			// See if within ~3% of full
 			ShiftRight (Local2, 5, Local3)
-			If (LGreater (Local1, Subtract (Local2, Local3)) && LLess (Local1, Add (Local2, Local3)))
+			If (LGreater (Local1, Local2 - Local3) && LLess (Local1, Add (Local2, Local3)))
 			{
 				Store (Local2, Local1)
 			}