diff --git a/httpx/_client.py b/httpx/_client.py
index 6a39feea..c4ae96dd 100644
--- a/httpx/_client.py
+++ b/httpx/_client.py
@@ -183,7 +183,6 @@ class BoundAsyncStream(AsyncByteStream):
         elapsed = time.perf_counter() - self._start
         response = self._response()
         if response is not None:
-            assert 0
             response.elapsed = datetime.timedelta(seconds=elapsed)
         await self._stream.aclose()