--- a/toolkit/components/places/nsNavHistory.cpp
+++ b/toolkit/components/places/nsNavHistory.cpp
@@ -944,20 +944,16 @@ nsNavHistory::EvaluateQueryForNode(const
 //    We might have interesting encodings and different case in the host name.
 //    This will convert that host name into an ASCII host name by sending it
 //    through the URI canonicalization. The result can be used for comparison
 //    with other ASCII host name strings.
 nsresult // static
 nsNavHistory::AsciiHostNameFromHostString(const nsACString& aHostName,
                                           nsACString& aAscii)
 {
-  aAscii.Truncate();
-  if (aHostName.IsEmpty()) {
-    return NS_OK;
-  }
   // To properly generate a uri we must provide a protocol.
   nsAutoCString fakeURL("http://");
   fakeURL.Append(aHostName);
   nsCOMPtr<nsIURI> uri;
   nsresult rv = NS_NewURI(getter_AddRefs(uri), fakeURL);
   NS_ENSURE_SUCCESS(rv, rv);
   rv = uri->GetAsciiHost(aAscii);
   NS_ENSURE_SUCCESS(rv, rv);