diff --git a/tests/functional/nar-access.sh b/tests/functional/nar-access.sh
index 218b521fb..87981e7d9 100644
--- a/tests/functional/nar-access.sh
+++ b/tests/functional/nar-access.sh
@@ -27,9 +27,8 @@ diff -u baz.cat-nar $storePath/foo/baz
 
 # Check that 'nix store cat' fails on invalid store paths.
 invalidPath="$(dirname $storePath)/99999999999999999999999999999999-foo"
-mv $storePath $invalidPath
+cp -r $storePath $invalidPath
 expect 1 nix store cat $invalidPath/foo/baz
-mv $invalidPath $storePath
 
 # Test --json.
 diff -u \