diff --git a/src/librustc/lint/builtin.rs b/src/librustc/lint/builtin.rs
index f5845dcae128..5dea0dbc8966 100644
--- a/src/librustc/lint/builtin.rs
+++ b/src/librustc/lint/builtin.rs
@@ -516,7 +516,7 @@ declare_lint_pass! {
 
 // this could be a closure, but then implementing derive traits
 // becomes hacky (and it gets allocated)
-#[derive(PartialEq, RustcEncodable, RustcDecodable, Debug)]
+#[derive(PartialEq)]
 pub enum BuiltinLintDiagnostics {
     Normal,
     BareTraitObject(Span, /* is_global */ bool),
diff --git a/src/librustc/lint/context.rs b/src/librustc/lint/context.rs
index bd561b41c57f..492d8f1f8a5f 100644
--- a/src/librustc/lint/context.rs
+++ b/src/librustc/lint/context.rs
@@ -66,7 +66,7 @@ pub struct LintStore {
 
 /// Lints that are buffered up early on in the `Session` before the
 /// `LintLevels` is calculated
-#[derive(PartialEq, Debug)]
+#[derive(PartialEq)]
 pub struct BufferedEarlyLint {
     pub lint_id: LintId,
     pub ast_id: ast::NodeId,