diff --git a/bindgen.opam b/bindgen.opam
index f91ad3d..fc5ff38 100644
--- a/bindgen.opam
+++ b/bindgen.opam
@@ -10,6 +10,7 @@ homepage: "https://github.com/ocaml-sys/ocaml-bindgen"
 bug-reports: "https://github.com/ocaml-sys/ocaml-bindgen/issues"
 depends: [
   "clangml" {>= "4.8.0"}
+  "stringext"
   "ocaml"
   "dune" {>= "3.13"}
   "odoc" {with-doc}
diff --git a/dune-project b/dune-project
index f9cf44e..40910cf 100644
--- a/dune-project
+++ b/dune-project
@@ -22,7 +22,8 @@
  (description "A longer description")
  (depends
    (clangml (>= "4.8.0"))
-   ocaml 
+   stringext
+   ocaml
    dune)
  (tags
   (topics "to describe" your project)))