diff --git a/definitions/Makefile.am b/definitions/Makefile.am
index 700b8f4c1..06db12299 100644
--- a/definitions/Makefile.am
+++ b/definitions/Makefile.am
@@ -16306,12 +16306,12 @@ dist_definitionsmars_DATA = \
 	mars/grib.edmo.cl.def\
 	mars/grib.edmo.fc.def\
 	mars/grib.edmo.ssd.def\
-	mars/grib.efas.an.def\
 	mars/grib.efas.cf.def\
 	mars/grib.efas.fc.def\
 	mars/grib.efas.fu.def\
 	mars/grib.efas.go.def\
 	mars/grib.efas.pf.def\
+	mars/grib.efas.sfo.def\
 	mars/grib.efhc.cf.def\
 	mars/grib.efhc.icp.def\
 	mars/grib.efhc.pf.def\
diff --git a/definitions/mars/grib.efas.sia.def b/definitions/mars/grib.efas.sfo.def
similarity index 91%
rename from definitions/mars/grib.efas.sia.def
rename to definitions/mars/grib.efas.sfo.def
index 0d8be9c8e..a66d7053d 100644
--- a/definitions/mars/grib.efas.sia.def
+++ b/definitions/mars/grib.efas.sfo.def
@@ -1,4 +1,5 @@
-# EFAS Simulated Analysis (Water Balance)
+# Simulation forced with observations (EFAS)
+# Water Balance
 
 # ECC-701
 alias mars.step = endStep;
diff --git a/definitions/mars/type.table b/definitions/mars/type.table
index e7a3b60bd..d9f6486b3 100644
--- a/definitions/mars/type.table
+++ b/definitions/mars/type.table
@@ -56,7 +56,7 @@
 70 or Ocean reanalysis
 71 fx Flux forcing
 72 fu Fill-up
-73 sia EFAS simulated Analysis
+73 sfo Simulation forced with observations
 80 fcmean Forecast mean
 81 fcmax Forecast maximum
 82 fcmin Forecast minimum
diff --git a/src/grib_accessor_class_g2_mars_labeling.c b/src/grib_accessor_class_g2_mars_labeling.c
index b80148547..18492138b 100644
--- a/src/grib_accessor_class_g2_mars_labeling.c
+++ b/src/grib_accessor_class_g2_mars_labeling.c
@@ -369,8 +369,8 @@ static int extra_set(grib_accessor* a,long val)
             break;
         case 70:    /* Ocean reanalysis     (or) */
         case 71:    /* Flux forcing         (fx) */
-        case 72:    /* EFAS Fill-up         (fu) */
-        case 73:    /* EFAS Simulated Analysis */
+        case 72:    /* Fill-up              (fu) */
+        case 73:    /* Simulation forced with observations (sfo) */
         case 80:    /* Forecast mean        (fcmean) */
         case 81:    /* Forecast maximum     (fcmax) */
         case 82:    /* Forecast minimum     (fcmin) */
diff --git a/tests/grib_efas.sh b/tests/grib_efas.sh
index 3dca6cdc9..1d4f686f4 100755
--- a/tests/grib_efas.sh
+++ b/tests/grib_efas.sh
@@ -66,7 +66,7 @@ grib_check_key_equals $temp1 anoffset 25
 grib_check_key_equals $temp1 anoffsetFirst,anoffsetLast,anoffsetFrequency "MISSING MISSING MISSING"
 
 # MARS step
-types="sia fu go"
+types="sfo fu go"
 for t in $types; do
   ${tools_dir}/grib_set -s setLocalDefinition=1,localDefinitionNumber=41,type=$t,stepType=accum,stepRange=12-36,paramId=260268 \
   $sample $temp1