Dapper - like operator using DynamicParameters

This works:

var list = conn.Query<int>(
  "select Id from Person where Id in @ids", 
  new { ids = new int[] { 1, 2, 3 } }
);

This throws "No mapping exists from object type System.Int32[] to a known managed provider native type.":

DynamicParameters parameters = new DynamicParameters(
  new { ids = new int[] { 1, 2, 3 } }
);
var list2 = conn.Query<int>(
  "select Id from Person where Id in @ids", 
  parameters
);

Any ideas?