diff --git a/dyson/expressions/expression.py b/dyson/expressions/expression.py
index 9b05f3f..897368d 100644
--- a/dyson/expressions/expression.py
+++ b/dyson/expressions/expression.py
@@ -152,9 +152,10 @@ def build_gf_moments(self, nmom, store_vectors=True, left=False):
                     u = apply_hamiltonian(u)
 
         if left:
-            t = t.transpose(1, 2).conj()
+            t = t.transpose(0,2,1).conj()
 
         return t
+    
 
     def build_gf_chebyshev_moments(self, nmom, store_vectors=True, left=False, scaling=None):
         """Build moments of the Green's function using Chebyshev polynomials.