diff --git a/lib/tests/misc.nix b/lib/tests/misc.nix
index 7b3a6b4e60b8..5fa95828df69 100644
--- a/lib/tests/misc.nix
+++ b/lib/tests/misc.nix
@@ -496,7 +496,7 @@ runTests {
 
   testToPretty =
     let
-      deriv = derivation { name = "test"; builder = "/bin/sh"; system = builtins.currentSystem; };
+      deriv = derivation { name = "test"; builder = "/bin/sh"; system = "aarch64-linux"; };
     in {
     expr = mapAttrs (const (generators.toPretty { multiline = false; })) rec {
       int = 42;