diff --git a/mandaye/response.py b/mandaye/response.py
index 1668b60..685e9c6 100644
--- a/mandaye/response.py
+++ b/mandaye/response.py
@@ -77,7 +77,7 @@ def _500(path, msg, exception=None, env=None):
         logger.exception("500 %s: %s, %s, env: %r" % (path, msg, tb_str, env))
         if email:
             try:
-                email.sent('internal server error %s' % exception,
+                email.sent('internal server error %r' % exception,
                         _get_text_error(tb_str, path, env=env))
             except Exception, e:
                 logger.exception(e)