Can't find OrderBy on Queryable with the "supplied arguments".

I have a method that I want to use to sort a list:

private static IQueryable<T> BuildQuery<T>(IQueryable<T> query, 
                                           string methodName, 
                                           Expression<Func<T, object>> property)             
    {
        var typeArgs = new[] { query.ElementType, property.Body.Type };

        methodCall = Expression.Call(typeof (Queryable),
                                                  methodName,
                                                  typeArgs,
                                                  query.Expression,
                                                  property);

        return query.Provider.CreateQuery<T>(methodCall);
    }

I get an exception when I execute the code using the following args:

var myPreExistingQuery = new List<SomeType>{ new SomeType() }.AsQueryable();
var query = BuildQuery(myPreExistingQuery, "OrderBy", x => x.SomeProperty);

The exception is:

No method 'OrderBy' on type 'System.Linq.Queryable' is compatible with the supplied arguments.

Can anyone see what I'm missing here?

EDIT:

I tried another overload of Expression.Call() and got the same same exception:

private static IQueryable<T> BuildQuery<T>(IQueryable<T> query, string methodName, Expression<Func<T, object>> propertyExpression)             
    {
        var methodCall = Expression.Call(query.Expression,
                                         methodName,
                                         new[] {query.ElementType, property.Body.Type},
                                         new[] {propertyExpression});

        return query.Provider.CreateQuery<T>(methodCall);
    }