--- a/netwerk/base/nsProtocolProxyService.cpp
+++ b/netwerk/base/nsProtocolProxyService.cpp
@@ -1860,21 +1860,21 @@ nsProtocolProxyService::ApplyFilters(nsI
 {
     if (!(info.flags & nsIProtocolHandler::ALLOWS_PROXY))
         return;
 
     // We prune the proxy list prior to invoking each filter.  This may be
     // somewhat inefficient, but it seems like a good idea since we want each
     // filter to "see" a valid proxy list.
 
-    nsresult rv;
     nsCOMPtr<nsIProxyInfo> result;
 
     for (FilterLink *iter = mFilters; iter; iter = iter->next) {
         PruneProxyInfo(info, list);
+        nsresult rv = NS_OK;
         if (iter->filter) {
           nsCOMPtr<nsIURI> uri;
           rv = GetProxyURI(channel, getter_AddRefs(uri));
           if (uri) {
             rv = iter->filter->ApplyFilter(this, uri, *list,
                                            getter_AddRefs(result));
           }
         } else if (iter->channelFilter) {