diff --git a/pkgs/development/ocaml-modules/inotify/default.nix b/pkgs/development/ocaml-modules/inotify/default.nix
index e3599a2304a..44b34beb79d 100644
--- a/pkgs/development/ocaml-modules/inotify/default.nix
+++ b/pkgs/development/ocaml-modules/inotify/default.nix
@@ -25,6 +25,10 @@ stdenv.mkDerivation rec {
 	configureFlags = [ "--enable-lwt"
 	  (stdenv.lib.optionalString doCheck "--enable-tests") ];
 
+	postConfigure = stdenv.lib.optionalString doCheck ''
+	  echo '<lib_test/test_inotify_lwt.*>: pkg_threads' | tee -a _tags
+	'';
+
 	doCheck = true;
 	checkTarget = "test";