diff --git a/pkgs/development/ocaml-modules/postgresql/default.nix b/pkgs/development/ocaml-modules/postgresql/default.nix
index d87f6b39efb8..4140baa675cb 100644
--- a/pkgs/development/ocaml-modules/postgresql/default.nix
+++ b/pkgs/development/ocaml-modules/postgresql/default.nix
@@ -17,6 +17,7 @@ buildDunePackage rec {
 
   nativeBuildInputs = [ postgresql ];
   buildInputs = [ dune-configurator ];
+  propagatedBuildInputs = [ postgresql ];
 
   meta = {
     description = "Bindings to the PostgreSQL library";