diff --git a/daphne/server.py b/daphne/server.py
index 8da4a61..a6d3819 100755
--- a/daphne/server.py
+++ b/daphne/server.py
@@ -21,6 +21,7 @@ if current_reactor is not None:
             + "you can fix this warning by importing daphne.server early in your codebase or "
             + "finding the package that imports Twisted and importing it later on.",
             UserWarning,
+            stacklevel=2,
         )
         del sys.modules["twisted.internet.reactor"]
         asyncioreactor.install(twisted_loop)