diff --git a/Lib/test/test_tools/test_fixcid.py b/Lib/test/test_tools/test_fixcid.py
index 7f25c17..bce029b 100644
--- a/Lib/test/test_tools/test_fixcid.py
+++ b/Lib/test/test_tools/test_fixcid.py
@@ -83,7 +83,8 @@
         script = os.path.join(scriptsdir, "fixcid.py")
         with support.swap_attr(sys, "argv", argv), \
                 support.swap_attr(sys, "stdin", StringIO(input)), \
-                support.captured_stdout() as output:
+                support.captured_stdout() as output, \
+                support.captured_stderr():
             try:
                 runpy.run_path(script, run_name="__main__")
             except SystemExit as exit: