diff --git a/definitions/grib1/2.98.171.table b/definitions/grib1/2.98.171.table
index 9baea3f48..a3753e5b7 100644
--- a/definitions/grib1/2.98.171.table
+++ b/definitions/grib1/2.98.171.table
@@ -90,8 +90,8 @@
 157 ra Relative humidity anomaly (%)
 158 tspa Tendency of surface pressure anomaly (Pa s**-1)
 159 blha Boundary layer height anomaly (m)
-160 sdora Standard deviation of orography anomaly (~)
-161 isora Anisotropy of sub-gridscale orography anomaly (~)
+160 sdora Standard deviation of orography anomaly (m)
+161 isora Anisotropy of sub-gridscale orography anomaly (m)
 162 anora Angle of sub-gridscale orography anomaly (radians)
 163 slora Slope of sub-gridscale orography anomaly (~)
 164 tcca Total cloud cover anomaly ((0 - 1))
diff --git a/definitions/grib1/2.98.200.table b/definitions/grib1/2.98.200.table
index 0ebd521a2..0f867735c 100644
--- a/definitions/grib1/2.98.200.table
+++ b/definitions/grib1/2.98.200.table
@@ -141,7 +141,7 @@
 158 tspdiff Tendency of surface pressure difference (Pa s**-1)
 159 blhdiff Boundary layer height difference (m)
 160 sdordiff Standard deviation of orography difference (~)
-161 isordiff Anisotropy of sub-gridscale orography difference (~)
+161 isordiff Anisotropy of sub-gridscale orography difference (m)
 162 anordiff Angle of sub-gridscale orography difference (radians)
 163 slordiff Slope of sub-gridscale orography difference (~)
 164 tccdiff Total cloud cover difference ((0 - 1))
diff --git a/definitions/grib1/localConcepts/ecmf/units.def b/definitions/grib1/localConcepts/ecmf/units.def
index 288b63890..6e52990b9 100644
--- a/definitions/grib1/localConcepts/ecmf/units.def
+++ b/definitions/grib1/localConcepts/ecmf/units.def
@@ -2805,7 +2805,7 @@
 	 indicatorOfParameter = 160 ;
 	}
 #Anisotropy of sub-gridscale orography difference
-'~' = {
+'m' = {
 	 table2Version = 200 ;
 	 indicatorOfParameter = 161 ;
 	}
@@ -14150,12 +14150,12 @@
 	 indicatorOfParameter = 159 ;
 	}
 #Standard deviation of orography anomaly
-'~' = {
+'m' = {
 	 table2Version = 171 ;
 	 indicatorOfParameter = 160 ;
 	}
 #Anisotropy of sub-gridscale orography anomaly
-'~' = {
+'m' = {
 	 table2Version = 171 ;
 	 indicatorOfParameter = 161 ;
 	}
diff --git a/definitions/grib2/localConcepts/ecmf/units.def b/definitions/grib2/localConcepts/ecmf/units.def
index 3dbfa6e5d..7b5a9834f 100644
--- a/definitions/grib2/localConcepts/ecmf/units.def
+++ b/definitions/grib2/localConcepts/ecmf/units.def
@@ -2028,7 +2028,7 @@
 	 parameterNumber = 160 ;
 	}
 #Anisotropy of sub-gridscale orography difference
-'~' = {
+'m' = {
 	 discipline = 192 ;
 	 parameterCategory = 200 ;
 	 parameterNumber = 161 ;
@@ -18438,13 +18438,13 @@
 	 parameterNumber = 159 ;
 	}
 #Standard deviation of orography anomaly
-'~' = {
+'m' = {
 	 discipline = 192 ;
 	 parameterCategory = 171 ;
 	 parameterNumber = 160 ;
 	}
 #Anisotropy of sub-gridscale orography anomaly
-'~' = {
+'m' = {
 	 discipline = 192 ;
 	 parameterCategory = 171 ;
 	 parameterNumber = 161 ;