diff --git a/pkgs/build-support/trivial-builders/test/sample.nix b/pkgs/build-support/trivial-builders/test/sample.nix
index 060be011093a..27aee6b73dbe 100644
--- a/pkgs/build-support/trivial-builders/test/sample.nix
+++ b/pkgs/build-support/trivial-builders/test/sample.nix
@@ -12,4 +12,8 @@ in
   norefs = writeText "hi" "hello";
   helloRef = writeText "hi" "hello ${hello}";
   helloFigletRef = writeText "hi" "hello ${hello} ${figlet}";
+  inherit (pkgs)
+    emptyFile
+    emptyDirectory
+  ;
 }