diff --git a/codegen/src/lib.rs b/codegen/src/lib.rs
index d4d0a247..a638dbd3 100644
--- a/codegen/src/lib.rs
+++ b/codegen/src/lib.rs
@@ -144,10 +144,8 @@
 #![allow(deprecated)]
 
 #[macro_use] extern crate log;
-extern crate rustc;
 extern crate syntax;
 extern crate syntax_ext;
-extern crate syntax_pos;
 extern crate rustc_plugin;
 extern crate rocket;
 
diff --git a/contrib/tests/templates.rs b/contrib/tests/templates.rs
index c6725af2..abf1de48 100644
--- a/contrib/tests/templates.rs
+++ b/contrib/tests/templates.rs
@@ -1,4 +1,3 @@
-extern crate rocket;
 extern crate rocket_contrib;
 
 use std::env;
diff --git a/examples/handlebars_templates/src/main.rs b/examples/handlebars_templates/src/main.rs
index 9fc90593..660aae5c 100644
--- a/examples/handlebars_templates/src/main.rs
+++ b/examples/handlebars_templates/src/main.rs
@@ -3,7 +3,6 @@
 
 extern crate rocket_contrib;
 extern crate rocket;
-extern crate serde_json;
 #[macro_use] extern crate serde_derive;
 
 #[cfg(test)] mod tests;
diff --git a/examples/json/src/main.rs b/examples/json/src/main.rs
index c5d04774..e02aa6fc 100644
--- a/examples/json/src/main.rs
+++ b/examples/json/src/main.rs
@@ -2,7 +2,6 @@
 #![plugin(rocket_codegen)]
 
 extern crate rocket;
-extern crate serde_json;
 #[macro_use] extern crate rocket_contrib;
 #[macro_use] extern crate serde_derive;
 
diff --git a/examples/todo/src/main.rs b/examples/todo/src/main.rs
index 4e5c2457..2a082108 100644
--- a/examples/todo/src/main.rs
+++ b/examples/todo/src/main.rs
@@ -2,7 +2,6 @@
 #![plugin(rocket_codegen)]
 
 extern crate rocket;
-extern crate serde_json;
 #[macro_use] extern crate diesel;
 #[macro_use] extern crate diesel_codegen;
 #[macro_use] extern crate serde_derive;