diff --git a/test/unit/test_dftd3.f90 b/test/unit/test_dftd3.f90
index e2bc091e..1c4945da 100644
--- a/test/unit/test_dftd3.f90
+++ b/test/unit/test_dftd3.f90
@@ -928,6 +928,7 @@ subroutine test_pbed3bj_actinides(error)
       & 2.01082807362334_wp, 1.34838807211157_wp,-4.70482633508447_wp],&
       & [3, 17])
    mol%periodic = [.false.]
+   allocate(mol%lattice(0,0))
 
    call new_rational_damping(param, inp)
    call test_dftd3_gen(error, mol, param, -1.4131143363689097E-001_wp)