diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index e3a8980a975c..99ab9fbcf5fa 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -853,13 +853,13 @@ pub struct Field {
 
 pub type SpannedIdent = Spanned<Ident>;
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Debug, Copy)]
+#[derive(Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, Copy)]
 pub enum BlockCheckMode {
     Default,
     Unsafe(UnsafeSource),
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, Debug, Copy)]
+#[derive(Clone, PartialEq, RustcEncodable, RustcDecodable, Debug, Copy)]
 pub enum UnsafeSource {
     CompilerGenerated,
     UserProvided,