diff -r -U 3 minecraft\net\minecraft\util\HttpUtil.java minecraft_patched\net\minecraft\util\HttpUtil.java
--- minecraft\net\minecraft\util\HttpUtil.java
+++ minecraft_patched\net\minecraft\util\HttpUtil.java
@@ -218,7 +218,7 @@
             }
          }
       });
-      return listenablefuture;
+      return (ListenableFuture<Object>) listenablefuture;
    }
 
    public static int func_76181_a() throws IOException {