diff --git a/src/MNH/write_lfifm1_for_diag.f90 b/src/MNH/write_lfifm1_for_diag.f90
index 99fcf98875dffea8759db62579cb8afa73f60be5..6e8dab3e72671fde1265b4fcf1a85b3f67050841 100644
--- a/src/MNH/write_lfifm1_for_diag.f90
+++ b/src/MNH/write_lfifm1_for_diag.f90
@@ -2912,6 +2912,7 @@ IF (LTHW) THEN
     TZFIELD%NGRID      = 1
     TZFIELD%NTYPE      = TYPEREAL
     TZFIELD%NDIMS      = 2
+    CALL IO_WRITE_FIELD(TPFILE,TZFIELD,ZWORK21)
   END IF
 END IF
 !