diff --git a/definitions/grib2/localConcepts/ecmf/unstructuredGridSubtype.def b/definitions/grib2/localConcepts/ecmf/unstructuredGridSubtype.def
index 926277b83..0f9911a54 100644
--- a/definitions/grib2/localConcepts/ecmf/unstructuredGridSubtype.def
+++ b/definitions/grib2/localConcepts/ecmf/unstructuredGridSubtype.def
@@ -4,5 +4,5 @@
 'V' = { numberOfGridInReference = 3; }
 'W' = { numberOfGridInReference = 4; }
 'F' = { numberOfGridInReference = 5; }
-'E' = { numberOfGridInReference = 6; }
+'C' = { numberOfGridInReference = 6; }
 'N' = { numberOfGridInReference = 7; }