diff --git a/byg/src/Types/Dependency.hs b/byg/src/Types/Dependency.hs
index 112485c..b563182 100644
--- a/byg/src/Types/Dependency.hs
+++ b/byg/src/Types/Dependency.hs
@@ -63,7 +63,7 @@ formatDependencyTrees = T.concat . (formatDependencyTrees' "")
 
         formatUToken = \case
           UToken i ->
-            [ T.pack (printf "%02d" i) ]
+            [ T.pack (printf "%03d" i) ]
           UTupleToken (a, b) ->
             concat [ [ "tup(" ]
                    , formatUToken a