diff --git a/devices.py b/devices.py
index 5b38e3c..23d3dc9 100644
--- a/devices.py
+++ b/devices.py
@@ -138,7 +138,7 @@ attExp = sd.xoptics.attenuator_aramis.AttenuatorAramis(
     description="Attenuator Alvra"
 )
 
-mono = sd.xoptics.dcm.Double_Crystal_Mono(
+mono = sd.xoptics.dcm.DoubleCrystalMono(
     "SAROP11-ODCM105",
     description="Alvra DCM Monochromator"
 )