diff --git a/src/MNH/default_desfmn.f90 b/src/MNH/default_desfmn.f90
index 0cb0834fc5021228a6c47dd2fd6f46c4c86ca9e2..ec5d84aa2cd52c1a55de46928d05e6539969a838 100644
--- a/src/MNH/default_desfmn.f90
+++ b/src/MNH/default_desfmn.f90
@@ -296,7 +296,7 @@ IF (KMI == 1) THEN
   XRELAX_HEIGHT_TOP = 30000.
   XRELAX_TIME = 864000.
   LPACK      = .TRUE.
-  NHALO      = 1
+  NHALO      = 3
 #ifdef MNH_SX5
   CSPLIT     ='YSPLITTING'   ! NEC vectoriel architecture , low number of PROC
 #else