diff --git a/src/parser/ligodity/Lexer.mll b/src/parser/ligodity/Lexer.mll
index c2027470a..d3f92a382 100644
--- a/src/parser/ligodity/Lexer.mll
+++ b/src/parser/ligodity/Lexer.mll
@@ -6,7 +6,11 @@
 (* UTILITIES *)
 
 let sprintf = Printf.sprintf
-module SMap = Utils.String.Map
+
+module Region = Simple_utils.Region
+module Pos    = Simple_utils.Pos
+module SMap   = Utils.String.Map
+module SSet   = Utils.String.Set
 
 (* Making a natural from its decimal notation (for Tez) *)
 
diff --git a/src/parser/ligodity/dune b/src/parser/ligodity/dune
index 0ddebe72f..ed67c795c 100644
--- a/src/parser/ligodity/dune
+++ b/src/parser/ligodity/dune
@@ -13,6 +13,7 @@
  (libraries
    str
    zarith
+   simple-utils
    tezos-utils
  )
  (flags (:standard -open Simple_utils ))