diff --git a/python/lsst/daf/butler/remote_butler/server/handlers/_external_query.py b/python/lsst/daf/butler/remote_butler/server/handlers/_external_query.py
index 44023eba9a..d08bafd276 100644
--- a/python/lsst/daf/butler/remote_butler/server/handlers/_external_query.py
+++ b/python/lsst/daf/butler/remote_butler/server/handlers/_external_query.py
@@ -90,7 +90,15 @@ def query_execute(
             ctx,
             spec,
         )
-        return StreamingResponse(output_generator, media_type="application/jsonlines")
+        return StreamingResponse(
+            output_generator,
+            media_type="application/jsonlines",
+            headers={
+                # Instruct the Kubernetes ingress to not buffer the response,
+                # so that keep-alives reach the client promptly.
+                "X-Accel-Buffering": "no"
+            },
+        )
 
     # Mypy thinks that ExitStack might swallow an exception.
     assert False, "This line is unreachable."