diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index 0ee8bcc..c2677d2 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -330,6 +330,10 @@
                 for m in [msvcrt.CRT_WARN, msvcrt.CRT_ERROR, msvcrt.CRT_ASSERT]:
                     msvcrt.CrtSetReportMode(m, msvcrt.CRTDBG_MODE_FILE)
                     msvcrt.CrtSetReportFile(m, msvcrt.CRTDBG_FILE_STDERR)
+        else:
+            print(("No handler for option {}.  Please report this as a bug "
+                  "at http://bugs.python.org.").format(o), file=sys.stderr)
+            sys.exit(1)
     if generate and verbose:
         usage("-g and -v don't go together!")
     if single and fromfile: