diff --git a/src/MNH/default_desfmn.f90 b/src/MNH/default_desfmn.f90
index 2076ca15b468c7865a5caec8eb7566b69a171e78..e0be701042dab0627e2d5792a3c7d9c5d0efaf21 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      = 3
+  NHALO      = 1
 #ifdef MNH_SX5
   CSPLIT     ='YSPLITTING'   ! NEC vectoriel architecture , low number of PROC
 #else