diff --git a/plugins/proto/RemoteFortressReader.proto b/plugins/proto/RemoteFortressReader.proto
index b416b96ec..963bf3bf8 100644
--- a/plugins/proto/RemoteFortressReader.proto
+++ b/plugins/proto/RemoteFortressReader.proto
@@ -120,6 +120,7 @@ enum TileDigDesignation
 
 enum HairStyle
 {
+    UNKEPT = -1;
     NEATLY_COMBED = 0;
     BRAIDED = 1;
     DOUBLE_BRAID = 2;