diff --git a/server.go b/server.go
index 7583633..907d307 100644
--- a/server.go
+++ b/server.go
@@ -277,7 +277,11 @@ func onDisconnectCleanup(c *Channel) {
 
 		delete(c.server.rooms, c)
 	}
+	
+	go deleteSid(c)
+}
 
+func deleteSid(c *Channel) {
 	c.server.sidsLock.Lock()
 	defer c.server.sidsLock.Unlock()