diff --git a/crates/gosub_html5/src/node/arena.rs b/crates/gosub_html5/src/node/arena.rs
index 515d989f..c5a96b9f 100644
--- a/crates/gosub_html5/src/node/arena.rs
+++ b/crates/gosub_html5/src/node/arena.rs
@@ -146,7 +146,7 @@ mod tests {
     }
 
     #[test]
-    #[should_panic(expected = "assertion `left == right` failed: Node is already attached to an arena")]
+    #[should_panic(expected = "Node is already attached to an arena")]
     fn register_node_twice() {
         let mut doc_handle = DocumentBuilderImpl::new_document(None);