diff --git a/src/MNH/write_lesn.f90 b/src/MNH/write_lesn.f90
index 51bc3e7bb368ac2d2a2431af2c50b90de64e3131..abe5b0c9d67c36e9985ce5a9ad9f13c12f1682a5 100644
--- a/src/MNH/write_lesn.f90
+++ b/src/MNH/write_lesn.f90
@@ -1376,7 +1376,7 @@ IF (HLES_AVG==' ' .OR. HLES_AVG=='A') THEN
      
   IF (LUSERR) &
   CALL LES_DIACHRO_SURF(TPDIAFILE,"ACCU_PREC    ",  &
-     "Accu precip rate","mm/day",XLES_ACPRR,HLES_AVG)   
+     "Accu precip rate","mm",XLES_ACPRR,HLES_AVG)   
 
   IF (LUSERC) &
   CALL LES_DIACHRO_SURF(TPDIAFILE,"ZMAXCF    ",  &