diff --git a/script/CalibrateGonio.py b/script/CalibrateGonio.py
index 7494de3..38ce4e1 100644
--- a/script/CalibrateGonio.py
+++ b/script/CalibrateGonio.py
@@ -14,7 +14,7 @@ caput("X10DA-OP1-MO1:BraggEAO",EnergyAbsolut)
 time.sleep(sleepTime)
 BraggGonio2=caget("X10DA-OP1-MO1:BraggThetaAO.VAL")
 OldOffset=caget("X10DA-OP1-MO1:ROTX.OFF")
-NewOffset=OldOffset+BraggGonio2-BraggGonio1
+NewOffset=OldOffset-BraggGonio2+BraggGonio1
 caput("X10DA-OP1-MO1:ROTX.OFF", NewOffset)
 EnergyGonio=caget("X10DA-OP1-MO1:BraggEAO.VAL")
 EnergyAbsolut=caget("X10DA-OP1-MO1:ENC-ROTXEnergy.VAL")