diff --git a/pkgs/development/ocaml-modules/ppxlib/default.nix b/pkgs/development/ocaml-modules/ppxlib/default.nix
index 822c30daf26d..d5b09b1ddc21 100644
--- a/pkgs/development/ocaml-modules/ppxlib/default.nix
+++ b/pkgs/development/ocaml-modules/ppxlib/default.nix
@@ -21,7 +21,7 @@ let param = {
 
 if param ? max_version && lib.versionAtLeast ocaml.version param.max_version
 || param ? min_version && !lib.versionAtLeast ocaml.version param.min_version
-then throw "ppxlib-${param.version} is not available for OCaml ${ocaml.version}"
+then throw "ppxlib-${version} is not available for OCaml ${ocaml.version}"
 else
 
 buildDunePackage rec {