diff --git a/python/damask/_orientation.py b/python/damask/_orientation.py
index c0952c5fd..adfa839d1 100644
--- a/python/damask/_orientation.py
+++ b/python/damask/_orientation.py
@@ -145,7 +145,7 @@ class Orientation: # ToDo: make subclass of lattice and Rotation
         quat=np.empty( [r , 4])
         for rot in range(r):
             for sym in range(equi.shape[0]):
-                if self.lattice.symmetry.inFZ(equi.as_Rodrigues(vector=True)[sym,rot]) is True:
+                if self.lattice.symmetry.inFZ(equi.as_Rodrigues(vector=True)[sym,rot]) == True:
                     quat[rot]=equi.as_quaternion()[sym,rot]
         return self.__class__(quat,self.lattice)