diff --git a/src/SURFEX/modd_ch_surfn.F90 b/src/SURFEX/modd_ch_surfn.F90
index 6114c9132946c60dc2147da017b12579bbafe55b..3108882b02d72437eaa285a5ebbe5cfa6e76d8fa 100644
--- a/src/SURFEX/modd_ch_surfn.F90
+++ b/src/SURFEX/modd_ch_surfn.F90
@@ -85,7 +85,7 @@ IF (LHOOK) CALL DR_HOOK("MODD_CH_SURF_N:CH_SURF_INIT",0,ZHOOK_HANDLE)
 YCH_SURF%CCH_EMIS='NONE'
 YCH_SURF%CCH_BIOEMIS='NONE'
 YCH_SURF%CCH_DMSEMIS='NONE'
-YCH_SURF%CCHEM_SURF_FILE='EXSEG1.nam'
+YCH_SURF%CCHEM_SURF_FILE='MNHC.input'
 YCH_SURF%LCH_SURF_EMIS=.FALSE.
 YCH_SURF%LCH_EMIS=.FALSE.
 YCH_SURF%LCH_BIOEMIS=.FALSE.