diff --git a/lib/trinity/sim_file.ex b/lib/trinity/sim_file.ex
index 1794ca3..cf57c91 100644
--- a/lib/trinity/sim_file.ex
+++ b/lib/trinity/sim_file.ex
@@ -85,8 +85,7 @@ defmodule Trinity.SimFile do
     end
   end
 
-  # TODO: much larger
-  @block_size 4
+  @block_size 1024
 
   defp sim_pread(fd, loc, bytes) do
     %{file_data: file_data} = get_sim()