diff --git a/pkgs/applications/editors/emacs/elisp-packages/session-management-for-emacs/default.nix b/pkgs/applications/editors/emacs/elisp-packages/session-management-for-emacs/default.nix
index 64a8402650b2..afc51e8fcc2a 100644
--- a/pkgs/applications/editors/emacs/elisp-packages/session-management-for-emacs/default.nix
+++ b/pkgs/applications/editors/emacs/elisp-packages/session-management-for-emacs/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, emacs }:
+{ stdenv, fetchurl, emacs, lib }:
 
 stdenv.mkDerivation rec {
   pname = "session-management-for-emacs";