diff --git a/src/utils_complex/MolPyscfToQPkpts.py b/src/utils_complex/MolPyscfToQPkpts.py
index 46419ca2..33b55252 100644
--- a/src/utils_complex/MolPyscfToQPkpts.py
+++ b/src/utils_complex/MolPyscfToQPkpts.py
@@ -893,6 +893,7 @@ def pyscf2QP2(cell,mf, kpts, kmesh=None, cas_idx=None, int_threshold = 1E-8,
 
     with h5py.File(qph5path,'a') as qph5:
         qph5['qmcpack'].attrs['PBC']=True 
+        qph5['qmcpack'].attrs['cart']=cell.cart 
         qph5.create_dataset('qmcpack/Super_Twist',(1,3),dtype="f8",data=sp_twist)
         qph5.create_dataset('qmcpack/LatticeVectors',(3,3),dtype="f8",data=cell.lattice_vectors().T)
         qph5.create_dataset('qmcpack/eigenval',(1,Nk*nmo),dtype="f8",data=mf.mo_energy)