diff --git a/browser.py b/browser.py
index 9d44a9b..a581877 100644
--- a/browser.py
+++ b/browser.py
@@ -207,7 +207,15 @@ def set(self, value):
     def open(self, url, data=None):
         """See zope.testbrowser.interfaces.IBrowser"""
         self._start_timer()
-        self.mech_browser.open(url, data)
+        try:
+            self.mech_browser.open(url, data)
+        except urllib2.HTTPError, e:
+            if e.code >= 200 and e.code <= 299:
+                # 200s aren't really errors
+                pass
+            else:
+                raise
+
         self._stop_timer()
         self._changed()