diff --git a/mozilla/extensions/negotiateauth/nsHttpNegotiateAuth.cpp b/mozilla/extensions/negotiateauth/nsHttpNegotiateAuth.cpp
index ec3632cc351..5e3d68af78d 100644
--- a/mozilla/extensions/negotiateauth/nsHttpNegotiateAuth.cpp
+++ b/mozilla/extensions/negotiateauth/nsHttpNegotiateAuth.cpp
@@ -143,7 +143,7 @@ nsHttpNegotiateAuth::ChallengeReceived(nsIHttpChannel *httpChannel,
         httpInternal->GetProxyInfo(getter_AddRefs(proxyInfo));
         NS_ENSURE_STATE(proxyInfo);
 
-        service = proxyInfo->Host();
+        proxyInfo->GetHost(service);
     }
     else {
         PRBool allowed = TestPref(uri, kNegotiateAuthTrustedURIs);