C# Converting Int To Int64?

we are in the process of upgrading our crappy cms system and the new assemblies have changed from int to int64. I'm running into a problem when trying to build now. here is one excerpt of code that is causing a problem.

IDictionary<int, string> aliases
= new UrlAliasApi().GetUrlAliasesByType(
Company.DataLayer.Enumeration.UrlAliasType.Recipe);
foreach (ContentBase recipe in mergedResultset)
{
// if alias exists, overwrite quicklink!
string alias;
if (aliases.TryGetValue(recipe.Id, out alias))
{
recipe.QuickLink = alias;
}
}

The error is

Error 323 The best overloaded method match for 'System.Collections.Generic.IDictionary.TryGetValue(int, out string)' has some invalid arguments Its referring to recipe.Id which is an Int64 value.