diff --git a/definitions/grib2/local.98.300.def b/definitions/grib2/local.98.300.def
index af4d5b866..360163434 100644
--- a/definitions/grib2/local.98.300.def
+++ b/definitions/grib2/local.98.300.def
@@ -1,7 +1,7 @@
 # Local definition 300: Multi-dimensional parameters
 # Warning: This is now DEPRECATED. See ECC-1440
 
-codetable[1] dimensionType "grib2/dimensionType.table"=0;
+codetable[1] dimensionType "grib2/dimensionType.table" = "layer" : string_type;
 
 # The n-th dimension (out of total number of dimensions)
 unsigned[2] dimensionNumber;