1 files changed, 1 insertions, 1 deletions
diff --git a/std/io/readers_test.ts b/std/io/readers_test.ts
index 22982c924..041fd78a8 100644
--- a/std/io/readers_test.ts
+++ b/std/io/readers_test.ts
@@ -33,6 +33,6 @@ test(async function ioMultiReader(): Promise<void> {
   const n = await copyN(w, r, 4);
   assertEquals(n, 4);
   assertEquals(w.toString(), "abcd");
-  await copy(w, r);
+  await copy(r, w);
   assertEquals(w.toString(), "abcdef");
 });