diff --git a/pkgs/development/ocaml-modules/labltk/default.nix b/pkgs/development/ocaml-modules/labltk/default.nix
index d70a334c2be7..c2fdfb535de9 100644
--- a/pkgs/development/ocaml-modules/labltk/default.nix
+++ b/pkgs/development/ocaml-modules/labltk/default.nix
@@ -51,6 +51,10 @@ let
       version = "8.06.15";
       sha256 = "sha256-I/y5qr5sasCtlrwxL/Lex79rg0o4tzDMBmQY7MdpU2w=";
     };
+    "5.4" = {
+      version = "8.06.16";
+      sha256 = "sha256-T+5x6nfxrJh4NEMCPFY/9AMug2oqxNl4CGw1lRy9ne4=";
+    };
   };
   param = {
     inherit stdenv;