diff --git a/spectrum/src/frontends/slack/SlackUserRegistration.h b/spectrum/src/frontends/slack/SlackUserRegistration.h
index a0369f8bcf04e925bb8e407f1fd6d61b69137081..8ed2438629f4735db79fa9de5393dbc132ad6661 100644
--- a/spectrum/src/frontends/slack/SlackUserRegistration.h
+++ b/spectrum/src/frontends/slack/SlackUserRegistration.h
@@ -22,8 +22,6 @@
 
 #include "transport/UserRegistration.h"
 
-#include <boost/signal.hpp>
-
 namespace Transport {
 
 struct UserInfo;