--- a/rdf/base/nsRDFXMLParser.cpp
+++ b/rdf/base/nsRDFXMLParser.cpp
@@ -8,16 +8,17 @@
 
 #include "nsIComponentManager.h"
 #include "nsIParser.h"
 #include "nsCharsetSource.h"
 #include "nsIRDFContentSink.h"
 #include "nsParserCIID.h"
 #include "nsStringStream.h"
 #include "nsNetUtil.h"
+#include "nsNullPrincipal.h"
 
 static NS_DEFINE_CID(kParserCID, NS_PARSER_CID);
 
 NS_IMPL_ISUPPORTS(nsRDFXMLParser, nsIRDFXMLParser)
 
 nsresult
 nsRDFXMLParser::Create(nsISupports* aOuter, REFNSIID aIID, void** aResult)
 {
@@ -109,18 +110,27 @@ nsRDFXMLParser::ParseString(nsIRDFDataSo
 
     if (! listener)
         return NS_ERROR_FAILURE;
 
     nsCOMPtr<nsIInputStream> stream;
     rv = NS_NewCStringInputStream(getter_AddRefs(stream), aString);
     if (NS_FAILED(rv)) return rv;
 
+    nsCOMPtr<nsIPrincipal> nullPrincipal =
+      do_CreateInstance("@mozilla.org/nullprincipal;1", &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
     nsCOMPtr<nsIChannel> channel;
-    rv = NS_NewInputStreamChannel(getter_AddRefs(channel), aBaseURI, stream,
+    rv = NS_NewInputStreamChannel(getter_AddRefs(channel),
+                                  aBaseURI,
+                                  stream,
+                                  nullPrincipal,
+                                  nsILoadInfo::SEC_NORMAL,
+                                  nsIContentPolicy::TYPE_OTHER,
                                   NS_LITERAL_CSTRING("text/xml"));
     if (NS_FAILED(rv)) return rv;
 
     listener->OnStartRequest(channel, nullptr);
     listener->OnDataAvailable(channel, nullptr, stream, 0, aString.Length());
     listener->OnStopRequest(channel, nullptr, NS_OK);
 
     return NS_OK;