Linq contains confusion

I have noticed something odd with linq and the Contains method. It seems to get confused on which Contains method to call.

if (myString.Contains(strVar, StringComparison.OrdinalIgnoreCase))
{
  // Code here                  
}

The above code doesn't compile with the following error:

The type arguments for method 'System.Linq.Enumerable.Contains(System.Collections.Generic.IEnumerable, TSource, System.Collections.Generic.IEqualityComparer)' cannot be inferred from the usage. Try specifying the type arguments explicitly.

If I remove the using linq statement it is happy with the contains (but brakes all the linq code).

What is the correct syntax to tell the compiler I want to use the String.Contains method and not Linqs?

Cheers