diff --git a/chrome/src/nsChromeRegistry.cpp b/chrome/src/nsChromeRegistry.cpp
index 43da94733e88..f5447b4a9eda 100644
--- a/chrome/src/nsChromeRegistry.cpp
+++ b/chrome/src/nsChromeRegistry.cpp
@@ -1413,8 +1413,8 @@ NS_IMETHODIMP nsChromeRegistry::UpdateDynamicDataSource(nsIRDFDataSource *aDataS
   rv = arcs->HasMoreElements(&moreElements);
   if (NS_FAILED(rv)) return rv;
 
-  nsXPIDLCString value;
-  rv = aResource->GetValue(getter_Copies(value));
+  const char *value;
+  rv = aResource->GetValueConst(&value);
   if (NS_FAILED(rv)) return rv;
 
   while (moreElements)
@@ -1431,7 +1431,7 @@ NS_IMETHODIMP nsChromeRegistry::UpdateDynamicDataSource(nsIRDFDataSource *aDataS
       rv = literal->GetValueConst(&valueStr);
       if (NS_FAILED(rv)) return rv;
 
-      rv = WriteInfoToDataSource((const char*)value, valueStr, aIsOverlay, aUseProfile, aRemove);
+      rv = WriteInfoToDataSource(value, valueStr, aIsOverlay, aUseProfile, aRemove);
       if (NS_FAILED(rv)) return rv;
     }
     rv = arcs->HasMoreElements(&moreElements);
diff --git a/rdf/base/src/nsRDFXMLSerializer.cpp b/rdf/base/src/nsRDFXMLSerializer.cpp
index 8db445ed2aa8..bc24350a8773 100644
--- a/rdf/base/src/nsRDFXMLSerializer.cpp
+++ b/rdf/base/src/nsRDFXMLSerializer.cpp
@@ -643,8 +643,8 @@ nsRDFXMLSerializer::SerializeMember(nsIOutputStream* aStream,
     nsCOMPtr<nsIRDFLiteral> literal;
 
     if ((resource = do_QueryInterface(aMember)) != nsnull) {
-        nsXPIDLCString s;
-        if (NS_SUCCEEDED(rv = resource->GetValue( getter_Copies(s) ))) {
+        const char *s;
+        if (NS_SUCCEEDED(rv = resource->GetValueConst(&s))) {
 static const char kRDFLIResource1[] = "    <RDF:li resource=\"";
 static const char kRDFLIResource2[] = "\"/>\n";
 
@@ -658,8 +658,8 @@ static const char kRDFLIResource2[] = "\"/>\n";
         }
     }
     else if ((literal = do_QueryInterface(aMember)) != nsnull) {
-        nsXPIDLString value;
-        if (NS_SUCCEEDED(rv = literal->GetValue( getter_Copies(value) ))) {
+        const PRUnichar *value;
+        if (NS_SUCCEEDED(rv = literal->GetValueConst(&value))) {
 static const char kRDFLILiteral1[] = "    <RDF:li>";
 static const char kRDFLILiteral2[] = "</RDF:li>\n";
 
diff --git a/rdf/chrome/src/nsChromeRegistry.cpp b/rdf/chrome/src/nsChromeRegistry.cpp
index 43da94733e88..f5447b4a9eda 100644
--- a/rdf/chrome/src/nsChromeRegistry.cpp
+++ b/rdf/chrome/src/nsChromeRegistry.cpp
@@ -1413,8 +1413,8 @@ NS_IMETHODIMP nsChromeRegistry::UpdateDynamicDataSource(nsIRDFDataSource *aDataS
   rv = arcs->HasMoreElements(&moreElements);
   if (NS_FAILED(rv)) return rv;
 
-  nsXPIDLCString value;
-  rv = aResource->GetValue(getter_Copies(value));
+  const char *value;
+  rv = aResource->GetValueConst(&value);
   if (NS_FAILED(rv)) return rv;
 
   while (moreElements)
@@ -1431,7 +1431,7 @@ NS_IMETHODIMP nsChromeRegistry::UpdateDynamicDataSource(nsIRDFDataSource *aDataS
       rv = literal->GetValueConst(&valueStr);
       if (NS_FAILED(rv)) return rv;
 
-      rv = WriteInfoToDataSource((const char*)value, valueStr, aIsOverlay, aUseProfile, aRemove);
+      rv = WriteInfoToDataSource(value, valueStr, aIsOverlay, aUseProfile, aRemove);
       if (NS_FAILED(rv)) return rv;
     }
     rv = arcs->HasMoreElements(&moreElements);