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
@@ -221,7 +221,7 @@
             }
          }
       });
-      return listenablefuture;
+      return (ListenableFuture<Object>) listenablefuture;
    }
 
    @SideOnly(Side.CLIENT)