diff --git a/tests/unit/proxy/guardrails/guardrail_hooks/unified_guardrail/test_unified_guardrail.py b/tests/unit/proxy/guardrails/guardrail_hooks/unified_guardrail/test_unified_guardrail.py
index f2247b3d032..dfb49a48a06 100644
--- a/tests/unit/proxy/guardrails/guardrail_hooks/unified_guardrail/test_unified_guardrail.py
+++ b/tests/unit/proxy/guardrails/guardrail_hooks/unified_guardrail/test_unified_guardrail.py
@@ -53,7 +53,7 @@ async def _upstream(
 
 
 def _guarded_stream(
-    observer: _Observer, upstream: AsyncIterator[ModelResponseStream], *, route: str | None = "/chat/completions"
+    observer: _Observer, upstream: AsyncIterator[object], *, route: str | None = "/chat/completions"
 ) -> AsyncIterator[object]:
     return UnifiedLLMGuardrails().async_post_call_streaming_iterator_hook(
         user_api_key_dict=UserAPIKeyAuth(api_key="test", request_route=route),
@@ -96,6 +96,19 @@ async def test_a_failing_observer_never_breaks_the_stream(warning_messages: Call
     ]
 
 
+async def test_a_stream_no_handler_understands_is_forwarded_unobserved(
+    warning_messages: Callable[[str], list[str]],
+) -> None:
+    observer: Final = _Observer()
+
+    async def raw_bytes() -> AsyncIterator[bytes]:
+        yield b"data: raw\n\n"
+
+    sent: Final = [chunk async for chunk in _guarded_stream(observer, raw_bytes(), route=None)]
+
+    assert (sent, observer.observed, warning_messages("observe-only stream check")) == ([b"data: raw\n\n"], [], [])
+
+
 async def test_an_empty_stream_is_not_observed(warning_messages: Callable[[str], list[str]]) -> None:
     observer: Final = _Observer()