diff --git a/config/devices.properties b/config/devices.properties
index 81b6793..9fa6b6e 100644
--- a/config/devices.properties
+++ b/config/devices.properties
@@ -15,6 +15,7 @@ apertureTable=ch.psi.pshell.device.MotorGroupBase apertureX apertureY
 beamstopTable=ch.psi.pshell.device.MotorGroupBase beamstopX beamstopY beamstopZ
 collimatorTable=ch.psi.pshell.device.MotorGroupBase collimatorX collimatorY
 collimator=ch.psi.pshell.device.MotorGroupDiscretePositioner collimatorTable
+aperture=ch.psi.pshell.device.MotorGroupDiscretePositioner apertureTable
 #scintillator=ch.psi.pshell.epics.Manipulator 
 slit1H=ch.psi.pshell.epics.Slit X10SA-OP-SH1:TRX2 X10SA-OP-SH1:TRX1
 slit1V=ch.psi.pshell.epics.Slit X10SA-OP-SV1:TRY1 X10SA-OP-SV1:TRY2