diff --git a/lib/impl/helpers.nix b/lib/impl/helpers.nix
index 48a79fc..754cead 100644
--- a/lib/impl/helpers.nix
+++ b/lib/impl/helpers.nix
@@ -50,7 +50,7 @@ in rec {
   filterJobVariables = shouldContain: job:
     concatMapAttrs (
       name: value:
-        optionalAttrs ((hasInfix "/nix/store/" value) == shouldContain) {
+        optionalAttrs ((hasInfix builtins.storeDir value) == shouldContain) {
           ${name} = value;
         }
     )
diff --git a/tests/cilib_test.nix b/tests/cilib_test.nix
index 78e99a3..b53308c 100644
--- a/tests/cilib_test.nix
+++ b/tests/cilib_test.nix
@@ -129,7 +129,7 @@
           # sh
           ''
             set -euo pipefail
-            ${ntlib.helpers.path [pkgs.jq pkgs.gnugrep pkgs.coreutils]}
+            ${ntlib.helpers.path (with pkgs; [jq gnugrep coreutils])}
             echo "two keys, one json one pretty"
             jq 'keys | length == 2' "${pipeline}" | grep -q true
             echo "key[0] is exactly 'gitlab-ci:pipeline:test'"