diff --git a/src/MNH/advection_uvw.f90 b/src/MNH/advection_uvw.f90
index 591497a744c8fd36243b5588aad37828877a8e6a..d005a36253abda9e818988769e609c91e7d85763 100644
--- a/src/MNH/advection_uvw.f90
+++ b/src/MNH/advection_uvw.f90
@@ -490,6 +490,7 @@ if ( lbudget_w ) call Budget_store_end( tbudgets(NBUDGET_W), 'ADV', prws(:, :, :
 !-------------------------------------------------------------------------------
 !
 #ifdef MNH_OPENACC
+CALL MNH_REL_ZT4D(3,    IIBMS )
 CALL MNH_REL_ZT4D(ISPL, IZRWSB)
 CALL MNH_REL_ZT4D(ISPL, IZRVSB)
 CALL MNH_REL_ZT4D(ISPL, IZRUSB)