diff --git a/ablescript/src/host_interface.rs b/ablescript/src/host_interface.rs
index 740ce6e..d8db023 100644
--- a/ablescript/src/host_interface.rs
+++ b/ablescript/src/host_interface.rs
@@ -1,7 +1,5 @@
 /// Host Environment Interface
 pub trait HostInterface {
-    type Data;
-
     /// Print a string
     fn print(&mut self, string: &str, new_line: bool) -> std::io::Result<()>;
 
@@ -19,8 +17,6 @@ pub trait HostInterface {
 #[derive(Clone, Copy, Default)]
 pub struct Standard;
 impl HostInterface for Standard {
-    type Data = ();
-
     fn print(&mut self, string: &str, new_line: bool) -> std::io::Result<()> {
         use std::io::Write;