diff --git a/pims_nd2/nd2reader.py b/pims_nd2/nd2reader.py
index 64f0627..33fd418 100644
--- a/pims_nd2/nd2reader.py
+++ b/pims_nd2/nd2reader.py
@@ -80,6 +80,7 @@ def class_exts(cls):
     class_priority = 20
 
     def __init__(self, filename, series=0, channel=0):
+        super().__init__() #Initialize superclass FramesSequenceND
         if not os.path.isfile(filename):
             raise IOError('The file "{}" does not exist.'.format(filename))
         self.filename = str(filename)