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-rw-r--r--src/librustc_data_structures/sync.rs4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/librustc_data_structures/sync.rs b/src/librustc_data_structures/sync.rs
index a2893a60cb6..6a4012c8198 100644
--- a/src/librustc_data_structures/sync.rs
+++ b/src/librustc_data_structures/sync.rs
@@ -133,7 +133,7 @@ cfg_if! {
 
         pub type MTRef<'a, T> = &'a mut T;
 
-        #[derive(Debug)]
+        #[derive(Debug, Default)]
         pub struct MTLock<T>(T);
 
         impl<T> MTLock<T> {
@@ -228,7 +228,7 @@ cfg_if! {
 
         pub type MTRef<'a, T> = &'a T;
 
-        #[derive(Debug)]
+        #[derive(Debug, Default)]
         pub struct MTLock<T>(Lock<T>);
 
         impl<T> MTLock<T> {