diff --git a/lib/util/parser.ml b/lib/util/parser.ml
index 2127517..286a504 100644
--- a/lib/util/parser.ml
+++ b/lib/util/parser.ml
@@ -1,11 +1,7 @@
 include Angstrom
 
 module Syntax = struct
-  module Let_syntax = Angstrom.Let_syntax.Let_syntax
-
-  let ( let+ ) = ( let+ )
-  let ( and+ ) = ( and+ )
-  let ( let* ) = ( let* )
+  include Angstrom.Let_syntax
 
   let ( >>| ), ( *> ), ( <* ), ( <|> ), ( <$> ) =
     ( >>| ), ( *> ), ( <* ), ( <|> ), ( <$> )
diff --git a/lib/year2023/dune b/lib/year2023/dune
index f6e5fe2..0a1d141 100644
--- a/lib/year2023/dune
+++ b/lib/year2023/dune
@@ -5,7 +5,8 @@
     core
     ppx_jane
     re
-    util)
+    util
+    zarith)
   (preprocess
     (pps
      ppx_jane))