1 files changed, 3 insertions, 1 deletions
diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index 0ce83e79097..84d9f75532b 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -311,7 +311,9 @@ pub enum OutputType {
 }
 
 // Safety: Trivial C-Style enums have a stable sort order across compilation sessions.
-unsafe impl StableOrd for OutputType {}
+unsafe impl StableOrd for OutputType {
+    const CAN_USE_UNSTABLE_SORT: bool = true;
+}
 
 impl<HCX: HashStableContext> ToStableHashKey<HCX> for OutputType {
     type KeyType = Self;