diff --git a/definitions/grib2/products_crra.def b/definitions/grib2/products_crra.def
index f3a426dfc..003a282f0 100644
--- a/definitions/grib2/products_crra.def
+++ b/definitions/grib2/products_crra.def
@@ -45,7 +45,7 @@ if (section2Used == 1) {
 }
 
 # See GRIB-911 re typeOfProcessedData values in UERRA
-concept marsType {
+concept marsType(unknown) {
 
    fc = {
      typeOfProcessedData = 1;
@@ -73,20 +73,15 @@ concept marsType {
      typeOfGeneratingProcess = 0;
      generatingProcessIdentifier = 50;
    }
-
-   "default" = {
-     dummyc = 0;
-   }
 }
 
 # See GRIB-205 re no_copy
 # Cannot use typeOfProcessedData for stream. See GRIB-911
-concept marsStream {
+concept marsStream(unknown) {
 
     oper = {
       productDefinitionTemplateNumber = 8;
     }
-
     oper = {
       productDefinitionTemplateNumber = 0;
     }
@@ -94,14 +89,9 @@ concept marsStream {
     enda = {
       productDefinitionTemplateNumber = 11;
     }
-
     enda = {
       productDefinitionTemplateNumber = 1;
     }
-
-    "default" = {
-      dummyc = 0;
-    }
 } : no_copy;
 
 alias mars.stream = marsStream;
diff --git a/definitions/grib2/products_s2s.def b/definitions/grib2/products_s2s.def
index 0f093ec17..13c90fb72 100644
--- a/definitions/grib2/products_s2s.def
+++ b/definitions/grib2/products_s2s.def
@@ -24,8 +24,7 @@ if (centre is "cnmc" && subCentre == 102) {
 
 unalias mars.domain;
 
-concept marsType {
-
+concept marsType(unknown) {
    fc = {
      typeOfProcessedData = 2;
    }
@@ -46,19 +45,13 @@ concept marsType {
    "11" = {
      typeOfProcessedData = 4;
    }
-
-   "default" = {
-     dummyc = 0;
-   }
 }
 
 # See GRIB-205 re no_copy
-concept marsStream {
-
+concept marsStream(unknown) {
     oper = {
       typeOfProcessedData = 0;
     }
-
     oper = {
       typeOfProcessedData = 2;
     }
@@ -66,18 +59,12 @@ concept marsStream {
     enfo = {
       typeOfProcessedData = 3;
     }
-
     enfo = {
       typeOfProcessedData = 4;
     }
-
     enfo = {
       typeOfProcessedData = 8;
     }
-
-    "default" = {
-      dummyc = 0;
-    }
 } : no_copy;
 
 alias mars.stream = marsStream;
diff --git a/definitions/grib2/products_tigge.def b/definitions/grib2/products_tigge.def
index 3ff8f489e..880894999 100644
--- a/definitions/grib2/products_tigge.def
+++ b/definitions/grib2/products_tigge.def
@@ -34,7 +34,7 @@ if (section2Used == 1) {
     unalias mars.domain;                # No mars domain needed
 }
 
-concept marsType {
+concept marsType(unknown) {
 
    fc = {
      typeOfProcessedData = 2;
@@ -56,19 +56,14 @@ concept marsType {
    "11" = {
      typeOfProcessedData = 4;
    }
-
-   "default" = {
-     dummyc = 0;
-   }
 }
 
 # See GRIB-205 re no_copy
-concept marsStream {
+concept marsStream(unknown) {
 
     oper = {
       typeOfProcessedData = 0;
     }
-
     oper = {
       typeOfProcessedData = 2;
     }
@@ -76,18 +71,12 @@ concept marsStream {
     enfo = {
       typeOfProcessedData = 3;
     }
-
     enfo = {
       typeOfProcessedData = 4;
     }
-
     enfo = {
       typeOfProcessedData = 8;
     }
-
-    "default" = {
-      dummyc = 0;
-    }
 } : no_copy;
 
 alias mars.stream = marsStream;
diff --git a/definitions/grib2/products_uerra.def b/definitions/grib2/products_uerra.def
index 3879ed2c1..ef70ea316 100644
--- a/definitions/grib2/products_uerra.def
+++ b/definitions/grib2/products_uerra.def
@@ -40,8 +40,7 @@ alias mars.param = paramId;
 alias mars.origin = centre;
 
 # See GRIB-911 re typeOfProcessedData values in UERRA
-concept marsType {
-
+concept marsType(unknown) {
    fc = {
      typeOfProcessedData = 1;
    }
@@ -68,20 +67,14 @@ concept marsType {
      typeOfGeneratingProcess = 0;
      generatingProcessIdentifier = 50;
    }
-
-   "default" = {
-     dummyc = 0;
-   }
 }
 
 # See GRIB-205 re no_copy
 # Cannot use typeOfProcessedData for stream. See GRIB-911
-concept marsStream {
-
+concept marsStream(unknown) {
     oper = {
       productDefinitionTemplateNumber = 8;
     }
-
     oper = {
       productDefinitionTemplateNumber = 0;
     }
@@ -89,14 +82,9 @@ concept marsStream {
     enda = {
       productDefinitionTemplateNumber = 11;
     }
-
     enda = {
       productDefinitionTemplateNumber = 1;
     }
-
-    "default" = {
-      dummyc = 0;
-    }
 } : no_copy;
 
 alias mars.stream = marsStream;