diff --git a/library/alloc/src/boxed.rs b/library/alloc/src/boxed.rs
index e5d62447eb20e..2f5a4beaea2fd 100644
--- a/library/alloc/src/boxed.rs
+++ b/library/alloc/src/boxed.rs
@@ -183,6 +183,9 @@ use crate::vec::Vec;
 #[unstable(feature = "thin_box", issue = "92791")]
 pub use thin::ThinBox;
 
+#[cfg(not(no_global_oom_handling))]
+use crate::sync::Arc;
+
 mod thin;
 
 /// A pointer type that uniquely owns a heap allocation of type `T`.
@@ -1284,6 +1287,15 @@ impl Default for Box<str> {
     }
 }
 
+#[cfg(not(no_global_oom_handling))]
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Default for Arc<str> {
+    #[inline]
+    fn default() -> Self {
+        Arc::from("")
+    }
+}
+
 #[cfg(not(no_global_oom_handling))]
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: Clone, A: Allocator + Clone> Clone for Box<T, A> {