diff --git a/src/TOP/PISCES/P4Z/p5zprod.F90 b/src/TOP/PISCES/P4Z/p5zprod.F90
index d8cf514b398827cc72615c0dfcfb7a052d937c80..bc54b6e303c341ebb80d0cda11c6f5c9fb7211b7 100644
--- a/src/TOP/PISCES/P4Z/p5zprod.F90
+++ b/src/TOP/PISCES/P4Z/p5zprod.F90
@@ -85,7 +85,6 @@ CONTAINS
       REAL(wp) ::   zqfpmax, zqfnmax, zqfdmax
       REAL(wp) ::   zfact, zrfact2, zmaxsi, zratiosi, zsizetmp, zlimfac, zsilim
       CHARACTER (len=25) :: charout
-!      REAL(wp), DIMENSION(A2D(0)    ) :: zmixnano, zmixpico, zmixdiat
       REAL(wp), DIMENSION(A2D(0),jpk) :: zpislopeadn, zpislopeadp, zpislopeadd
       REAL(wp), DIMENSION(A2D(0),jpk) :: zprnut, zprmaxp, zprmaxn, zprmaxd
       REAL(wp), DIMENSION(A2D(0),jpk) :: zprbio, zprpic, zprdia, zysopt