diff --git a/plugins/Hartree_Fock/diagonalize_fock.irp.f b/plugins/Hartree_Fock/diagonalize_fock.irp.f
index b3003985..bc874514 100644
--- a/plugins/Hartree_Fock/diagonalize_fock.irp.f
+++ b/plugins/Hartree_Fock/diagonalize_fock.irp.f
@@ -1,4 +1,4 @@
- BEGIN_PROVIDER [ double precision, diagonal_Fock_matrix_mo, (ao_num) ]
+ BEGIN_PROVIDER [ double precision, diagonal_Fock_matrix_mo, (mo_tot_num) ]
 &BEGIN_PROVIDER [ double precision, eigenvectors_Fock_matrix_mo, (ao_num,mo_tot_num) ]
    implicit none
    BEGIN_DOC