diff --git a/crates/cli-support/src/js/mod.rs b/crates/cli-support/src/js/mod.rs
index 6de8a967..3b413fda 100644
--- a/crates/cli-support/src/js/mod.rs
+++ b/crates/cli-support/src/js/mod.rs
@@ -417,7 +417,7 @@ impl<'a> Context<'a> {
                         }
                         // errors
                         if (val instanceof Error) {
-                            return `${className}: ${val.message}\n${val.stack}`;
+                            return `${val.name}: ${val.message}\n${val.stack}`;
                         }
                         // TODO we could test for more things here, like `Set`s and `Map`s.
                         return className;