diff --git a/python/damask/_orientation.py b/python/damask/_orientation.py
index c28332012..06caf9b4c 100644
--- a/python/damask/_orientation.py
+++ b/python/damask/_orientation.py
@@ -165,7 +165,7 @@ class Orientation(Rotation,Crystal):
             Orientation to check for equality.
 
         """
-        return np.logical_not(self==other)
+        return np.logical_not(self==other) if isinstance(other, Orientation) else NotImplemented
 
 
     def isclose(self,