diff --git a/Pilz.Net/Api/Client/IBaseClient.cs b/Pilz.Net/Api/Client/IBaseClient.cs
index 753b08f..80056b0 100644
--- a/Pilz.Net/Api/Client/IBaseClient.cs
+++ b/Pilz.Net/Api/Client/IBaseClient.cs
@@ -8,6 +8,6 @@ public interface IBaseClient<T> where T : IDataObject
     Task<T> Get(int id);
     Task<IEnumerable<T>> GetAll();
     Task<IEnumerable<T>> GetAll(int offset, int amount);
-    Task<IEnumerable<T>> GetAll(int ids, int offset, int amount);
+    Task<IEnumerable<T>> GetAll(int[] ids, int offset, int amount);
     Task<T> Save(T item);
 }