diff --git a/fsl/fsleyes/displaycontext/group.py b/fsl/fsleyes/displaycontext/group.py
index cea1852f3fc88e92bdb5f68d2e6c948ac593e81c..e4ecee268a64d886c2159466dc856f646d1aa653 100644
--- a/fsl/fsleyes/displaycontext/group.py
+++ b/fsl/fsleyes/displaycontext/group.py
@@ -26,8 +26,7 @@ class OverlayGroup(props.HasProperties):
 
     
     _groupBindings = td.TypeDict({
-        'Display'        : ['enabled',
-                            'alpha'],
+        'Display'        : ['enabled'],
         'ImageOpts'      : ['volume',
                             'transform'],
         'VolumeOpts'     : ['interpolation'],