diff --git a/src/sled/event_bus/event_bus.h b/src/sled/event_bus/event_bus.h
index 7b68f5a..ac4b15d 100644
--- a/src/sled/event_bus/event_bus.h
+++ b/src/sled/event_bus/event_bus.h
@@ -80,7 +80,7 @@ public:
         if (dispatcher.is_empty()) { signals_.erase(iter); }
     }
 
-    bool IsEmpty(EventBus *bus) const
+    bool IsEmpty(EventBus *bus)
     {
         sled::SharedMutexReadLock lock(&shared_mutex_);
         auto iter = signals_.find(bus);