diff --git a/tests/get-with-headers.py b/tests/get-with-headers.py
--- a/tests/get-with-headers.py
+++ b/tests/get-with-headers.py
@@ -32,7 +32,8 @@ def request(host, path, show):
     response = conn.getresponse()
     print response.status, reasons.get(response.reason, response.reason)
     if show[:1] == ['-']:
-        show = [h for h, v in response.getheaders() if h.lower() not in show]
+        show = sorted(h for h, v in response.getheaders()
+                      if h.lower() not in show)
     for h in [h.lower() for h in show]:
         if response.getheader(h, None) is not None:
             print "%s: %s" % (h, response.getheader(h))