diff --git a/serialization/journal.proto b/serialization/journal.proto
index d0dd686a21..b433464c34 100644
--- a/serialization/journal.proto
+++ b/serialization/journal.proto
@@ -19,6 +19,7 @@ message NavigationFrameParameters {
   required int32 centre_index = 2;
   required int32 primary_index = 3 [(is_private) = true];
   required int32 secondary_index = 4 [(is_private) = true];
+  required double filler = 5;
 }
 
 message XYZ {