diff --git a/nd2reader/reader.py b/nd2reader/reader.py
index 139e2be..543f07c 100644
--- a/nd2reader/reader.py
+++ b/nd2reader/reader.py
@@ -10,6 +10,8 @@ class ND2Reader(FramesSequenceND):
     This is the main class: use this to process your .nd2 files.
     """
 
+    class_priority = 12
+
     def __init__(self, filename):
         super(self.__class__, self).__init__()
         self.filename = filename