diff --git a/flake.lock b/flake.lock
index a165f224..c882537e 100644
--- a/flake.lock
+++ b/flake.lock
@@ -9,11 +9,11 @@
         "rust-overlay": "rust-overlay"
       },
       "locked": {
-        "lastModified": 1759492050,
-        "narHash": "sha256-C2JH5chm5XWbPdt9xd8PLeDZiXd3Kywr+38BVDjhD4E=",
+        "lastModified": 1759502955,
+        "narHash": "sha256-DH9FwoTLY6wPBwnL/DPdSeBZnuNbGKNbA2kT6QJlfPo=",
         "owner": "aeneasverif",
         "repo": "charon",
-        "rev": "fd1c08e51e60be9bd9aecbc2c97f01b985a9a8d4",
+        "rev": "b51c1fcb513d7c41a5c2a6d73b5cca4d3ad908a8",
         "type": "github"
       },
       "original": {
diff --git a/lib/AstOfLlbc.ml b/lib/AstOfLlbc.ml
index 54fa4f23..c56f900f 100644
--- a/lib/AstOfLlbc.ml
+++ b/lib/AstOfLlbc.ml
@@ -1766,6 +1766,7 @@ let expression_of_rvalue (env : env) (p : C.rvalue) expected_ty : K.expr =
         (* The following are `type`s *)
         | C.CastFnPtr (f, t) | C.CastRawPtr (f, t) | C.CastUnsize (f, t, _) | C.CastTransmute (f, t)
           -> f = t
+        | C.CastConcretize _ -> false
       in
       if is_ident then
         expression_of_operand env e