diff --git a/semantic-conventions/src/tests/semconv/model/test_error_detection.py b/semantic-conventions/src/tests/semconv/model/test_error_detection.py
index 6b518f80..0536b0b4 100644
--- a/semantic-conventions/src/tests/semconv/model/test_error_detection.py
+++ b/semantic-conventions/src/tests/semconv/model/test_error_detection.py
@@ -166,7 +166,7 @@ def test_experimental_attr_stable_member(self):
         e = ex.exception
         msg = e.message.lower()
         self.assertIn(
-            "member 'one' is marked as stable, but it is not allowed on experimental attribute!",
+            "member 'one' is marked as stable but it is not allowed on experimental attribute!",
             msg,
         )
         self.assertEqual(e.line, 8)