diff --git a/lib/tests/misc.nix b/lib/tests/misc.nix
index 59ed1e507e2..01ff5ecf148 100644
--- a/lib/tests/misc.nix
+++ b/lib/tests/misc.nix
@@ -148,7 +148,7 @@ runTests {
             "${builtins.storeDir}/d945ibfx9x185xf04b890y4f9g3cbb63-python-2.7.11";
       in {
         storePath = isStorePath goodPath;
-        storePathDerivation = isStorePath (import ../.. {}).hello;
+        storePathDerivation = isStorePath (import ../.. { system = "x86_64-linux"; }).hello;
         storePathAppendix = isStorePath
           "${goodPath}/bin/python";
         nonAbsolute = isStorePath (concatStrings (tail (stringToCharacters goodPath)));