diff --git a/assets/tests/ruby/promise_runtime_error.rb b/assets/tests/ruby/promise_runtime_error.rb
index 48827fc..a3bdc78 100644
--- a/assets/tests/ruby/promise_runtime_error.rb
+++ b/assets/tests/ruby/promise_runtime_error.rb
@@ -1,5 +1,5 @@
 def test_func
-  rust_func.and_then do |x|
-    print("abc" + 5)
-  end
+  rust_func.and_then lambda { |x|
+    $state['x'] = x
+  }
 end