diff --git a/src/libnm-glib-aux/nm-json-aux.h b/src/libnm-glib-aux/nm-json-aux.h
index 936e914641..b61c1f843a 100644
--- a/src/libnm-glib-aux/nm-json-aux.h
+++ b/src/libnm-glib-aux/nm-json-aux.h
@@ -339,6 +339,7 @@ nm_value_type_to_json(NMValueType value_type, GString *gstr, gconstpointer p_fie
     case NM_VALUE_TYPE_STRING:
         nm_json_gstr_append_string(gstr, *((const char *const *) p_field));
         return;
+    case NM_VALUE_TYPE_NONE:
     case NM_VALUE_TYPE_UNSPEC:
         break;
     }
@@ -368,6 +369,7 @@ nm_value_type_from_json(const NMJsonVt * vt,
     case NM_VALUE_TYPE_STRING:
         return (nm_jansson_json_as_string(vt, elem, out_val) > 0);
 
+    case NM_VALUE_TYPE_NONE:
     case NM_VALUE_TYPE_UNSPEC:
         break;
     }
diff --git a/src/libnm-glib-aux/nm-value-type.h b/src/libnm-glib-aux/nm-value-type.h
index 6156896c14..541797e9bf 100644
--- a/src/libnm-glib-aux/nm-value-type.h
+++ b/src/libnm-glib-aux/nm-value-type.h
@@ -7,6 +7,7 @@
 #define __NM_VALUE_TYPE_H__
 
 typedef enum _nm_packed {
+    NM_VALUE_TYPE_NONE   = 0,
     NM_VALUE_TYPE_UNSPEC = 1,
     NM_VALUE_TYPE_BOOL   = 2,
     NM_VALUE_TYPE_INT32  = 3,
@@ -90,6 +91,7 @@ nm_value_type_cmp(NMValueType value_type, gconstpointer p_a, gconstpointer p_b)
         return 0;
     case NM_VALUE_TYPE_STRING:
         return nm_strcmp0(*((const char *const *) p_a), *((const char *const *) p_b));
+    case NM_VALUE_TYPE_NONE:
     case NM_VALUE_TYPE_UNSPEC:
         break;
     }
@@ -129,6 +131,7 @@ nm_value_type_copy(NMValueType value_type, gpointer dst, gconstpointer src)
             *((char **) dst) = g_strdup(*((const char *const *) src));
         }
         return;
+    case NM_VALUE_TYPE_NONE:
     case NM_VALUE_TYPE_UNSPEC:
         break;
     }
@@ -169,6 +172,7 @@ nm_value_type_get_from_variant(NMValueType value_type,
          * clear how many bits we would need. */
 
         /* fall-through */
+    case NM_VALUE_TYPE_NONE:
     case NM_VALUE_TYPE_UNSPEC:
         break;
     }
@@ -198,6 +202,7 @@ nm_value_type_to_variant(NMValueType value_type, gconstpointer src)
          * clear how many bits we would need. */
 
         /* fall-through */
+    case NM_VALUE_TYPE_NONE:
     case NM_VALUE_TYPE_UNSPEC:
         break;
     }
@@ -225,6 +230,7 @@ nm_value_type_get_variant_type(NMValueType value_type)
          * clear how many bits we would need. */
 
         /* fall-through */
+    case NM_VALUE_TYPE_NONE:
     case NM_VALUE_TYPE_UNSPEC:
         break;
     }