diff --git a/src/MNH/write_lfifm1_for_diag.f90 b/src/MNH/write_lfifm1_for_diag.f90
index c55a1b2f0564d748234c20179116477a15056f4e..93ca1f69921421c91ff0b7d46a4f0fb88fd97e6a 100644
--- a/src/MNH/write_lfifm1_for_diag.f90
+++ b/src/MNH/write_lfifm1_for_diag.f90
@@ -1419,7 +1419,7 @@ IF (LSALT) THEN
     WRITE(YRECFM,'(A4,I1)')'SLTMSS',JJ
     WRITE(YCOMMENT,'(A14,I1,A7)')'MASSCONC MODE ',JJ,'(ug/m3)'
     ILENCH=LEN(YCOMMENT)
-    ZWORK31(:,:,:)= ZN0_SLT(:,:,:,JJ)*4./3.**XPI*XDENSITY_SALT*1e9 & !kg-->ug
+    ZWORK31(:,:,:)= ZN0_SLT(:,:,:,JJ)*4./3.*XPI*XDENSITY_SALT*1e9 & !kg-->ug
        * (ZRG_SLT(:,:,:,JJ)**3)*1.d-18 &  !um-->m
        * exp(4.5*log(ZSIG_SLT(:,:,:,JJ))*log(ZSIG_SLT(:,:,:,JJ)))
     CALL FMWRIT(HFMFILE,YRECFM,CLUOUT,'XY',ZWORK31,IGRID,ILENCH,    &