diff --git a/tests/nix/default.nix b/tests/nix/default.nix
--- a/tests/nix/default.nix
+++ b/tests/nix/default.nix
@@ -49,7 +49,7 @@
             };
             testScript = mkOption {
               type = lines;
-              default = '''';
+              default = "";
               description = "test script for runNixOSTest";
               apply = stripTyping;
             };