diff --git a/library/std/src/sync/poison.rs b/library/std/src/sync/poison.rs
index 741312d5537e9..ababaa2f06635 100644
--- a/library/std/src/sync/poison.rs
+++ b/library/std/src/sync/poison.rs
@@ -55,6 +55,7 @@ impl Flag {
     }
 }
 
+#[derive(Clone)]
 pub struct Guard {
     panicking: bool,
 }