diff --git a/src/TOP/PISCES/P4Z/p4zbc.F90 b/src/TOP/PISCES/P4Z/p4zbc.F90
index f649f91f75e3215b1d348a08e704f4573de7a93a..6265cc35b1a694c24dc3354803c78f59335fc634 100644
--- a/src/TOP/PISCES/P4Z/p4zbc.F90
+++ b/src/TOP/PISCES/P4Z/p4zbc.F90
@@ -291,7 +291,7 @@ CONTAINS
          ENDIF
       END IF
 
-      ll_bc    = ( ln_trcbc .AND. lltrcbc )  .OR. ln_hydrofe .OR. ln_ironsed .OR. ln_ironice 
+      ll_bc    = ( ln_trcbc .AND. lltrcbc )  .OR. ln_hydrofe .OR. ln_ironsed .OR. ln_ironice .OR. ln_sediment 
       ll_dust  =  ln_trc_sbc(jpfer) .OR. ln_trc_sbc(jppo4) .OR. ln_trc_sbc(jpsil) .OR. ln_sediment
       ll_ndepo =  ln_trc_sbc(jpno3) .OR. ln_trc_sbc(jpnh4)   
       ll_river =  ln_trc_cbc(jpno3)