diff --git a/pkgs/development/ocaml-modules/ctypes/foreign.nix b/pkgs/development/ocaml-modules/ctypes/foreign.nix
index 1e082bff94dc..cb8f454e0e0c 100644
--- a/pkgs/development/ocaml-modules/ctypes/foreign.nix
+++ b/pkgs/development/ocaml-modules/ctypes/foreign.nix
@@ -24,6 +24,9 @@ buildDunePackage rec {
     lwt
   ];
 
+  # Fix build with gcc 14
+  env.NIX_CFLAGS_COMPILE = "-Wno-error=incompatible-pointer-types";
+
   meta = ctypes.meta // {
     description = "Dynamic access to foreign C libraries using Ctypes";
   };