diff --git a/sanic/server.py b/sanic/server.py
index bd0fdf37..f6d2cf28 100644
--- a/sanic/server.py
+++ b/sanic/server.py
@@ -119,7 +119,7 @@ class HttpProtocol(asyncio.Protocol):
         self.router = router
         self.signal = signal
         self.access_log = access_log
-        self.connections = connections or set()
+        self.connections = connections if connections is not None else set()
         self.request_handler = request_handler
         self.error_handler = error_handler
         self.request_timeout = request_timeout