diff --git a/src/librustc_back/target/mod.rs b/src/librustc_back/target/mod.rs
index 6ae74355a7a8a..afbe5bf72d11d 100644
--- a/src/librustc_back/target/mod.rs
+++ b/src/librustc_back/target/mod.rs
@@ -335,6 +335,7 @@ impl Target {
         key!(pre_link_args, list);
         key!(post_link_args, list);
         key!(allow_asm, bool);
+        key!(custom_unwind_resume, bool);
 
         base
     }