diff --git a/tests/snippets/stdlib_os.py b/tests/snippets/stdlib_os.py
index 85dbe6eb0d..e48d4c945f 100644
--- a/tests/snippets/stdlib_os.py
+++ b/tests/snippets/stdlib_os.py
@@ -280,7 +280,6 @@ if "win" not in sys.platform:
     assert isinstance(a, int)
     assert isinstance(b, int)
     assert isinstance(os.ttyname(b), str)
-    assert_raises(OSError, lambda: os.ttyname(a))
-    assert_raises(OSError, lambda: os.ttyname(999))
+    assert_raises(OSError, lambda: os.ttyname(9999))
     os.close(b)
     os.close(a)