diff --git a/definitions/grib1/2.98.128.table b/definitions/grib1/2.98.128.table
index 6d4f221b9..c5dd9991a 100644
--- a/definitions/grib1/2.98.128.table
+++ b/definitions/grib1/2.98.128.table
@@ -157,7 +157,7 @@
 157 r Relative humidity (%)
 158 tsp Tendency of surface pressure (Pa s**-1)
 159 blh Boundary layer height (m)
-160 sdor Standard deviation of orography (~)
+160 sdor Standard deviation of orography (m)
 161 isor Anisotropy of sub-gridscale orography (~)
 162 anor Angle of sub-gridscale orography (radians)
 163 slor Slope of sub-gridscale orography (~)
diff --git a/definitions/grib1/2.98.200.table b/definitions/grib1/2.98.200.table
index 0f867735c..60f353342 100644
--- a/definitions/grib1/2.98.200.table
+++ b/definitions/grib1/2.98.200.table
@@ -140,7 +140,7 @@
 157 rdiff Relative humidity difference (%)
 158 tspdiff Tendency of surface pressure difference (Pa s**-1)
 159 blhdiff Boundary layer height difference (m)
-160 sdordiff Standard deviation of orography difference (~)
+160 sdordiff Standard deviation of orography difference (m)
 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 (~)