diff --git a/tests/integration/local/invoke/test_integrations_cli.py b/tests/integration/local/invoke/test_integrations_cli.py
index 70711459d6..be015469d0 100644
--- a/tests/integration/local/invoke/test_integrations_cli.py
+++ b/tests/integration/local/invoke/test_integrations_cli.py
@@ -306,7 +306,7 @@ def test_invoke_returns_utf8(self):
 
         process_stdout = stdout.strip()
 
-        with open(self.event_utf8_path) as f:
+        with open(self.event_utf8_path, encoding="utf8") as f:
             expected_output = json.dumps(json.load(f), ensure_ascii=False)
 
         self.assertEqual(process.returncode, 0)