diff --git a/nixos/lib/testing/call-test.nix b/nixos/lib/testing/call-test.nix
index 3e137e78cd47..e3716bf163aa 100644
--- a/nixos/lib/testing/call-test.nix
+++ b/nixos/lib/testing/call-test.nix
@@ -10,7 +10,7 @@ in
     };
     result = mkOption {
       internal = true;
-      default = config;
+      default = config.test;
     };
   };
 }