diff --git a/definitions/grib1/localConcepts/ecmf/units.def b/definitions/grib1/localConcepts/ecmf/units.def
index bd5fa4766..c0e4217a2 100644
--- a/definitions/grib1/localConcepts/ecmf/units.def
+++ b/definitions/grib1/localConcepts/ecmf/units.def
@@ -9025,22 +9025,22 @@
 	 indicatorOfParameter = 48 ;
 	}
 #Instantaneous total lightning density
-'flashes/km2/day' = {
+'flashes km**-2 day**-1' = {
 	 table2Version = 228 ;
 	 indicatorOfParameter = 50 ;
 	}
 #Averaged total lightning density
-'flashes/km2/day' = {
+'flashes km**-2 day**-1' = {
 	 table2Version = 228 ;
 	 indicatorOfParameter = 51 ;
 	}
 #Instantaneous cloud-to-ground lightning density
-'flashes/km2/day' = {
+'flashes km**-2 day**-1' = {
 	 table2Version = 228 ;
 	 indicatorOfParameter = 52 ;
 	}
 #Averaged cloud-to-ground lightning density
-'flashes/km2/day' = {
+'flashes km**-2 day**-1' = {
 	 table2Version = 228 ;
 	 indicatorOfParameter = 53 ;
 	}