diff --git a/daphne/server.py b/daphne/server.py
index 8132e68..177a79a 100755
--- a/daphne/server.py
+++ b/daphne/server.py
@@ -6,7 +6,8 @@ if "twisted.internet.reactor" in sys.modules:
     warnings.warn(
         "Something has already installed a Twisted reactor. Attempting to uninstall it; " +
         "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."
+        "finding the package that imports Twisted and importing it later on.",
+        UserWarning,
     )
     del sys.modules["twisted.internet.reactor"]
 asyncioreactor.install()