diff --git a/Changes.md b/Changes.md
index 197d424d7..d1eb397fa 100644
--- a/Changes.md
+++ b/Changes.md
@@ -65,6 +65,9 @@ Unreleased
   - A new alert `melsend` has been added to the PPX (which warns by default)
     and can be turned into an error with `melange.ppx -alert ++melsend` once
     [ocaml/dune#11234](https://github.com/ocaml/dune/pull/11234) lands.
+- core: fix a crash related to finding constructor names in pattern matching triggered by dune's earlier implementation of `(implicit_transitive_deps false)`
+  ([#1238](https://github.com/melange-re/melange/pull/1238),
+  [#1262](https://github.com/melange-re/melange/pull/1262))
 
 4.0.1 2024-06-07
 ---------------
diff --git a/jscomp/core/matching_polyfill.cppo.ml b/jscomp/core/matching_polyfill.cppo.ml
index 45043a270..70b057774 100644
--- a/jscomp/core/matching_polyfill.cppo.ml
+++ b/jscomp/core/matching_polyfill.cppo.ml
@@ -56,6 +56,7 @@ let names_from_construct_pattern
   in
   let rec resolve_path n path =
     match Env.find_type path pat.pat_env with
+    | exception Not_found -> None
     | { type_kind = Type_variant (cstrs, _repr); _ } ->
         names_from_type_variant cstrs
     | { type_kind =
diff --git a/test/blackbox-tests/persistent-structure-error.t b/test/blackbox-tests/persistent-structure-error.t
index 76d2ed77d..6877bd449 100644
--- a/test/blackbox-tests/persistent-structure-error.t
+++ b/test/blackbox-tests/persistent-structure-error.t
@@ -26,8 +26,3 @@ The issue seems to happen due to a combination of two things:
   $ melc --bs-package-output inner -o inner/inner.cmj -c inner/inner.ml
   $ melc -I inner --bs-package-output outer -o outer/outer.cmj -c outer/outer.ml --bs-stop-after-cmj
   $ melc -I outer --bs-package-output . -o main.cmj -c main.ml --bs-stop-after-cmj
-  melc: internal error, uncaught exception:
-        Not_found
-        
-  [125]
-