diff --git a/crates/gpui/src/platform/mac/platform.rs b/crates/gpui/src/platform/mac/platform.rs
index 91e89fced8..7166206cb7 100644
--- a/crates/gpui/src/platform/mac/platform.rs
+++ b/crates/gpui/src/platform/mac/platform.rs
@@ -570,6 +570,7 @@ impl Platform for MacPlatform {
                     let _ = done_tx.send(result);
                 }
             });
+            let block = block.copy();
             let _: () = msg_send![workspace, setDefaultApplicationAtURL: app toOpenURLsWithScheme: scheme completionHandler: block];
         }