diff --git a/client/src/der.vala b/client/src/der.vala
index 184db40..a9f4897 100644
--- a/client/src/der.vala
+++ b/client/src/der.vala
@@ -71,8 +71,8 @@ namespace StudySystemClient.Der {
 	}
 
 	public abstract class Datum {
-		internal uint8 type;
-		internal uint8[] content;
+		protected uint8 type;
+		protected uint8[] content;
 
 		public uint8[] encode() {
 			var buffer = new ByteArray();