diff --git a/cache/cache.go b/cache/cache.go
index 02caec0..b9930c4 100644
--- a/cache/cache.go
+++ b/cache/cache.go
@@ -82,5 +82,5 @@ func DownloadDebianCache(cachePath string) (err error) {
 		return
 	}
 
-	return os.Rename(filepath.Join(tmp, resp.Filename), cachePath)
+	return os.Rename(resp.Filename, cachePath)
 }
diff --git a/cache/cache_test.go b/cache/cache_test.go
index b203082..e834ebd 100644
--- a/cache/cache_test.go
+++ b/cache/cache_test.go
@@ -29,7 +29,7 @@ func TestDownloadQemuImage(t *testing.T) {
 }
 
 func TestDownloadDebianCache(t *testing.T) {
-	tmp, err := ioutil.TempDir("", "out-of-tree_")
+	tmp, err := fs.TempDir()
 	if err != nil {
 		return
 	}