diff --git a/python/damask/_rotation.py b/python/damask/_rotation.py
index 118234bf1..166863e70 100644
--- a/python/damask/_rotation.py
+++ b/python/damask/_rotation.py
@@ -307,7 +307,8 @@ class Rotation:
             p_m = self.quaternion[...,1:]
             q_o = other.quaternion[...,0:1]
             p_o = other.quaternion[...,1:]
-            q = (q_m*q_o - np.einsum('...i,...i',p_m,p_o).reshape(self.shape+(1,)))
+            qmo = q_m*q_o
+            q = (qmo - np.einsum('...i,...i',p_m,p_o).reshape(qmo.shape))
             p = q_m*p_o + q_o*p_m + _P * np.cross(p_m,p_o)
             return self.copy(Rotation(np.block([q,p]))._standardize())
         else: