diff --git a/tests/simple-failing.builder.sh b/tests/simple-failing.builder.sh
deleted file mode 100644
index 6285488ca..000000000
--- a/tests/simple-failing.builder.sh
+++ /dev/null
@@ -1,2 +0,0 @@
-echo "This should fail"
-exit 1
diff --git a/tests/simple-failing.nix b/tests/simple-failing.nix
index 1e3a080ed..d176c9c51 100644
--- a/tests/simple-failing.nix
+++ b/tests/simple-failing.nix
@@ -2,7 +2,11 @@ with import ./config.nix;
 
 mkDerivation {
   name = "simple-failing";
-  builder = ./simple-failing.builder.sh;
+  builder = builtins.toFile "builder.sh"
+    ''
+      echo "This should fail"
+      exit 1
+    '';
   PATH = "";
   goodPath = path;
 }