diff --git a/krebs/5pkgs/simple/buildbot-slave-classic/default.nix b/krebs/5pkgs/simple/buildbot-slave-classic/default.nix
index 83da05c3f..0b1ea73a3 100644
--- a/krebs/5pkgs/simple/buildbot-slave-classic/default.nix
+++ b/krebs/5pkgs/simple/buildbot-slave-classic/default.nix
@@ -1,9 +1,9 @@
-{ stdenv, pkgs, python2Packages, fetchFromGitHub, coreutils }:
+{ stdenv, buildbot-classic, python2Packages, fetchFromGitHub, coreutils }:
 
 python2Packages.buildPythonApplication (rec {
   name = "buildbot-slave-classic-2017-07-23";
 
-  src = pkgs.buildbot-classic.src;
+  src = buildbot-classic.src;
 
   postUnpack = "sourceRoot=\${sourceRoot}/slave";