diff --git a/src/os/unix/mod.rs b/src/os/unix/mod.rs
index 30903d5..79ff795 100644
--- a/src/os/unix/mod.rs
+++ b/src/os/unix/mod.rs
@@ -6,7 +6,7 @@
 
 extern crate x11_dl;
 
-use {MouseMode, MouseButton, Scale, Key, KeyRepeat, WindowOptions};
+use {MouseMode, MouseButton, Scale, Key, KeyRepeat, WindowOptions, InputCallback};
 use key_handler::KeyHandler;
 use menu::Menu;
 use self::x11_dl::keysym::*;
diff --git a/src/os/windows/mod.rs b/src/os/windows/mod.rs
index 7669a69..397eac7 100644
--- a/src/os/windows/mod.rs
+++ b/src/os/windows/mod.rs
@@ -8,8 +8,7 @@ extern crate time;
 
 const INVALID_ACCEL: usize = 0xffffffff;
 
-use {Scale, Key, KeyRepeat, MouseButton, MouseMode, WindowOptions};
-
+use {Scale, Key, KeyRepeat, MouseButton, MouseMode, WindowOptions, InputCallback};
 use key_handler::KeyHandler;
 use menu::Menu;
 use error::Error;